🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 88 (from laksa120)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa088.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish","crawl_time":1776117901,"first_indexed_time":1747203608,"http_code":200,"src_unparsed":"org,foodallergy!www,\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish s443","src_root_hash":"2517139425591965288","history_drop_reason":null,"meta_title":"Shellfish - FoodAllergy.org","meta_descriptions":[],"attrs_boilerpipe_text":"What Is Shellfish Allergy?\nShellfish allergies are the most common food allergies in adults and among the most common food allergies in children. Approximately 2% of the U.S. population reports an allergy to shellfish.\n1\n Shellfish allergies are usually lifelong. \nWhen a person with an allergy to a particular shellfish is exposed to that shellfish, proteins in the shellfish bind to specific IgE antibodies made by the person’s immune system. This triggers the person’s immune defenses, leading to reaction symptoms that can be mild or very severe.\nThere are two groups of shellfish: crustaceans (such as shrimp, prawns, crab and lobster) and mollusks\/bivalves (such as clams, mussels, oysters, scallops, octopus, squid, abalone, snail). Allergy to crustaceans is more common than allergy to mollusks, with shrimp being the most common shellfish allergen for both children and adults.\nFinned fish and shellfish are not closely related. Being allergic to one does not always mean that you must avoid both, though care is needed to prevent cross-contact between fish and shellfish. Discuss this issue in detail with your allergist to make sure the appropriate food restrictions are implemented. \nAbout 60 percent of people with shellfish allergy experience their first allergic reaction as adults.\n3\n1\nSicherer SH, et al. Prevalence of seafood allergy in the United States determined by a random telephone survey. J Allergy Clin Immunol 2004;114:159.","attrs_markdown":"[![FARE - Food Allergy Research & Education Logo](https:\/\/www.foodallergy.org\/themes\/custom\/fare\/assets\/images\/logo-fare.svg)](https:\/\/www.foodallergy.org\/)  [close](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n\n- [Living With Food Allergy](https:\/\/www.foodallergy.org\/living-food-allergy)\n- [Research & Innovation](https:\/\/www.foodallergy.org\/research-and-innovation)\n- [Our Initiatives](https:\/\/www.foodallergy.org\/our-initiatives)\n\n- [back](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n- Food Allergy Essentials\n- [Common Allergens](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens)\n- [Food Allergy 101](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/food-allergy-101)\n- [Allergy Alerts & Ingredient Notices](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/allergy-alerts)\n- [Back to School Resource Hub](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/back-school-resource-hub)\n- [Food Allergy & Anaphylaxis Emergency Care Plan](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/food-allergy-anaphylaxis-emergency-care-plan)\n- [Recipes](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/living-teal\/feasting-fare)\n- [Free Downloadable Resources](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/free-downloadable-resources)\n- Information for you\n- [Newly Diagnosed](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/newly-diagnosed)\n- [Children with Food Allergies](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/children-food-allergies)\n- [Adolescents and Teens](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/teens-food-allergies)\n- [Adults with Allergies](https:\/\/www.foodallergy.org\/living-food-allergies\/information-you\/adults-food-allergies)\n- [Educators](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/educators)\n- [Healthcare Providers](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/healthcare-providers)\n- [College Staff](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/college-staff)\n- [Other Professionals](https:\/\/www.foodallergy.org\/living-food-allergies\/information-you\/other-professionals)\n- Join the Community\n- [Join the FARE Community](https:\/\/www.foodallergy.org\/living-food-allergies\/join-community\/sign-updates)\n- [Find a Support Group](https:\/\/www.foodallergy.org\/living-food-allergies\/join-community\/find-support-group)\n\n- [back](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n- Accelerating Innovation\n- [Elevating Care](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/elevating-care)\n- [Pioneering Advances in Diagnosis](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/food-allergy-diagnosis-and-testing)\n- [Early Introduction and Food Allergy Prevention](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/early-introduction-and-food-allergy-prevention)\n- [Developing Effective Treatments](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/food-allergy-treatments)\n- [Mind Meld Innovation Summit](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/mind-meld-innovation-summit)\n- Elevating Research\n- [FARE Patient Registry](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n- [FARE Clinical Network](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-clinical-network)\n- [FARE Data Coordinating Center](https:\/\/research.foodallergy.org\/)\n- [FARE Biobank](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-biobank)\n- [Clinical Trials](https:\/\/www.foodallergy.org\/resources\/clinical-trials)\n- [Recently Funded Research](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/recently-funded-research)\n- [Research Funding Opportunities](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/funding-opportunities)\n\n- [back](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n- Advocacy\n- [Food Allergy Issues](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/food-allergy-issues)\n- [Congressional Food Allergy Research Caucus](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/congressional-food-allergy-research-caucus)\n- [How to Advocate](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/how-advocate)\n- [Know Your Rights](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/know-your-rights)\n- [Courage at Congress](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/food-allergy-issues\/courage-congress)\n- [Ready to Care](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/ready-care)\n- Education Programs & Training\n- [FARE Training - Food Allergy Academy](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/fare-training)\n- [FARECheck](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/farecheck)\n- [FARE Food Allergy College Search](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/fare-food-allergy-college-program)\n- [FARE Webinars](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/fare-webinars)\n- [Attend an Event](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/special-events)\n- [Eat Early Eat Often](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/eat-early-eat-often)\n- [FARE Neighborhoods Initiative](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/fare-neighborhoods-initiative)\n- Awareness Campaigns\n- [Ready to Act](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/ready-act)\n- [Empower](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/empower)\n- [A World Unaware](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/world-unaware)\n- [Back-to-School Resource Hub](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/back-school-resource-hub)\n- [FARE 33](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/fare-33)\n- [Living Teal](https:\/\/www.foodallergy.org\/take-action\/living-teal)\n- [Teal Pumpkin Project](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/teal-pumpkin-project)\n- [Food Allergy Awareness Week](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/food-allergy-awareness-week)\n- [Youth Programs](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/youth-programs)\n\n[Take Action](https:\/\/www.foodallergy.org\/getting-involved-and-taking-action-fare) [Donate](https:\/\/www.foodallergy.org\/donate) [Donate](https:\/\/www.foodallergy.org\/donate)\n\n- [Join Patient Registry](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n- [About Us](https:\/\/www.foodallergy.org\/about-us)\n- [Resources](https:\/\/www.foodallergy.org\/resources)\n- [Corporate Partners](https:\/\/www.foodallergy.org\/corporate-partners)\n- [Media Room](https:\/\/www.foodallergy.org\/media-room)\n- [Blog](https:\/\/www.foodallergy.org\/fare-blog)\n\nClose Search\n\n[![FARE - Food Allergy Research & Education Logo](https:\/\/www.foodallergy.org\/themes\/custom\/fare\/assets\/images\/logo-fare.svg)](https:\/\/www.foodallergy.org\/)\n\nSearch Toggle\n\nMobile Nav Toggle\n\n- [Join Patient Registry](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n- [About Us](https:\/\/www.foodallergy.org\/about-us)\n- [Resources](https:\/\/www.foodallergy.org\/resources)\n- [Corporate Partners](https:\/\/www.foodallergy.org\/corporate-partners)\n- [Media Room](https:\/\/www.foodallergy.org\/media-room)\n- [Blog](https:\/\/www.foodallergy.org\/fare-blog)\n\n[Take Action](https:\/\/www.foodallergy.org\/getting-involved-and-taking-action-fare)\n\n[![](https:\/\/www.foodallergy.org\/sites\/default\/files\/styles\/260x200\/public\/2020-01\/patient-registry-banner520x400.png?h=1ad4cf65&itok=oKJIqiQY)](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n\n[Help Us Accelerate Food Allergy Research](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n\nJoin over 14,000 individuals and families managing food allergies who are sharing their food allergy stories and making a critical difference, helping to speed the search for new treatments and informing life-changing improvements in patient care.\n\n- [Sign Up! Become a Member of the FARE Family](https:\/\/www.foodallergy.org\/living-food-allergies\/join-community\/sign-updates)\n- [Attend an Event](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/special-events)\n- [Join Patient Registry](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n- [How to Advocate](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/how-advocate)\n- [OctoberFARE](https:\/\/www.foodallergy.org\/take-action\/octoberfare)\n- [FARE Food Allergy Summit](https:\/\/www.foodallergy.org\/take-action\/food-allergy-summit)\n- [Fundraise for FARE](https:\/\/fundraise.foodallergy.org\/campaign\/may-2026-community-challenge\/c784482)\n- [Volunteer with FARE](https:\/\/www.foodallergy.org\/take-action\/volunteer-fare)\n- [Teal Pumpkin Project](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/teal-pumpkin-project)\n\n[Donate](https:\/\/www.foodallergy.org\/donate)\n\n[![](https:\/\/www.foodallergy.org\/sites\/default\/files\/styles\/260x200\/public\/2020-01\/Untitled%20design%20%284%29-min.png?h=dba2d266&itok=nPj9s9lN)](https:\/\/www.foodallergy.org\/donate)\n\n[Donate Today](https:\/\/www.foodallergy.org\/donate)\n\nYou can help improve the lives of 33 million in the U.S. impacted by food allergy by supporting FARE (Food Allergy Research & Education) with your tax-deductible gift today.\n\n- [Make a Gift](https:\/\/www.foodallergy.org\/donate)\n- [Fundraise or Host a Walk for FARE](https:\/\/fundraise.foodallergy.org\/campaign\/may-2026-community-challenge\/c784482)\n- [More Ways to Give](https:\/\/www.foodallergy.org\/take-action\/ways-give)\n- [Special Events](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/special-events)\n- [Donate Monthly](https:\/\/www.foodallergy.org\/take-action\/donate-monthly)\n- [Planned Giving](https:\/\/farelegacy.org\/)\n\n[![FARE - Food Allergy Research & Education Logo](https:\/\/www.foodallergy.org\/themes\/custom\/fare\/assets\/images\/logo-fare.svg)](https:\/\/www.foodallergy.org\/)\n\n- [Living With Food Allergy](https:\/\/www.foodallergy.org\/living-food-allergy)\n  Food Allergy Essentials\n  \n  - [Common Allergens](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens)\n  - [Food Allergy 101](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/food-allergy-101)\n  - [Allergy Alerts & Ingredient Notices](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/allergy-alerts)\n  - [Back to School Resource Hub](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/back-school-resource-hub)\n  - [Food Allergy & Anaphylaxis Emergency Care Plan](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/food-allergy-anaphylaxis-emergency-care-plan)\n  - [Recipes](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/living-teal\/feasting-fare)\n  - [Free Downloadable Resources](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/free-downloadable-resources)\n  \n  Information for you\n  \n  - [Newly Diagnosed](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/newly-diagnosed)\n  - [Children with Food Allergies](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/children-food-allergies)\n  - [Adolescents and Teens](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/teens-food-allergies)\n  - [Adults with Allergies](https:\/\/www.foodallergy.org\/living-food-allergies\/information-you\/adults-food-allergies)\n  - [Educators](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/educators)\n  - [Healthcare Providers](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/healthcare-providers)\n  - [College Staff](https:\/\/www.foodallergy.org\/living-food-allergy\/information-you\/college-staff)\n  - [Other Professionals](https:\/\/www.foodallergy.org\/living-food-allergies\/information-you\/other-professionals)\n  \n  Join the Community\n  \n  - [Join the FARE Community](https:\/\/www.foodallergy.org\/living-food-allergies\/join-community\/sign-updates)\n  - [Find a Support Group](https:\/\/www.foodallergy.org\/living-food-allergies\/join-community\/find-support-group)\n- [Research & Innovation](https:\/\/www.foodallergy.org\/research-and-innovation)\n  Accelerating Innovation\n  \n  - [Elevating Care](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/elevating-care)\n  - [Pioneering Advances in Diagnosis](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/food-allergy-diagnosis-and-testing)\n  - [Early Introduction and Food Allergy Prevention](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/early-introduction-and-food-allergy-prevention)\n  - [Developing Effective Treatments](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/food-allergy-treatments)\n  - [Mind Meld Innovation Summit](https:\/\/www.foodallergy.org\/research-innovation\/accelerating-innovation\/mind-meld-innovation-summit)\n  \n  Elevating Research\n  \n  - [FARE Patient Registry](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n  - [FARE Clinical Network](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-clinical-network)\n  - [FARE Data Coordinating Center](https:\/\/research.foodallergy.org\/)\n  - [FARE Biobank](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-biobank)\n  - [Clinical Trials](https:\/\/www.foodallergy.org\/resources\/clinical-trials)\n  - [Recently Funded Research](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/recently-funded-research)\n  - [Research Funding Opportunities](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/funding-opportunities)\n- [Our Initiatives](https:\/\/www.foodallergy.org\/our-initiatives)\n  Advocacy\n  \n  - [Food Allergy Issues](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/food-allergy-issues)\n  - [Congressional Food Allergy Research Caucus](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/congressional-food-allergy-research-caucus)\n  - [How to Advocate](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/how-advocate)\n  - [Know Your Rights](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/know-your-rights)\n  - [Courage at Congress](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/food-allergy-issues\/courage-congress)\n  - [Ready to Care](https:\/\/www.foodallergy.org\/our-initiatives\/advocacy\/ready-care)\n  \n  Education Programs & Training\n  \n  - [FARE Training - Food Allergy Academy](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/fare-training)\n  - [FARECheck](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/farecheck)\n  - [FARE Food Allergy College Search](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/fare-food-allergy-college-program)\n  - [FARE Webinars](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/fare-webinars)\n  - [Attend an Event](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/special-events)\n  - [Eat Early Eat Often](https:\/\/www.foodallergy.org\/our-initiatives\/education-programs-training\/eat-early-eat-often)\n  - [FARE Neighborhoods Initiative](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/fare-neighborhoods-initiative)\n  \n  Awareness Campaigns\n  \n  - [Ready to Act](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/ready-act)\n  - [Empower](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/empower)\n  - [A World Unaware](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/world-unaware)\n  - [Back-to-School Resource Hub](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/back-school-resource-hub)\n  - [FARE 33](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/fare-33)\n  - [Living Teal](https:\/\/www.foodallergy.org\/take-action\/living-teal)\n  - [Teal Pumpkin Project](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/teal-pumpkin-project)\n  - [Food Allergy Awareness Week](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/food-allergy-awareness-week)\n  - [Youth Programs](https:\/\/www.foodallergy.org\/our-initiatives\/awareness-campaigns\/youth-programs)\n\nSearch Toggle\n\n- [Home](https:\/\/www.foodallergy.org\/)\n- [Living With Food Allergy](https:\/\/www.foodallergy.org\/living-food-allergy)\n  View Menu\n  - [Food Allergy Essentials](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n  - [Information for you](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n  - [Join the Community](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n  \n  Close Menu\n- [Common Allergens](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens)\n  View Menu\n  - [Egg](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/egg)\n  - [Fish](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens\/fish)\n  - [Milk](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/milk)\n  - [Peanut](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/peanut)\n  - [Sesame](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/sesame)\n  - [Shellfish](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n  - [Soy](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/soy)\n  - [Tree Nut](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens\/tree-nut)\n  - [Wheat](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens\/wheat)\n  - [Other Food Allergies](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/other-food-allergens)\n  - [Substitutions](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens\/substitutions)\n  - [Tips for Avoiding Your Allergen](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/tips-avoiding-your-allergen)\n  \n  Close Menu\n- Shellfish\n\nSHARE\n\n[Facebook](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish) [Twitter](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish) [Email](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish) [LinkedIn](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n\nSHARE\n\nCLOSE\n\n[Facebook](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish) [Twitter](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish) [Email](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish) [LinkedIn](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n# Shellfish Allergy\n\n## What Is Shellfish Allergy?\nShellfish allergies are the most common food allergies in adults and among the most common food allergies in children. Approximately 2% of the U.S. population reports an allergy to shellfish.1 Shellfish allergies are usually lifelong.\n\nWhen a person with an allergy to a particular shellfish is exposed to that shellfish, proteins in the shellfish bind to specific IgE antibodies made by the person’s immune system. This triggers the person’s immune defenses, leading to reaction symptoms that can be mild or very severe.\n\nThere are two groups of shellfish: crustaceans (such as shrimp, prawns, crab and lobster) and mollusks\/bivalves (such as clams, mussels, oysters, scallops, octopus, squid, abalone, snail). Allergy to crustaceans is more common than allergy to mollusks, with shrimp being the most common shellfish allergen for both children and adults.\n\nFinned fish and shellfish are not closely related. Being allergic to one does not always mean that you must avoid both, though care is needed to prevent cross-contact between fish and shellfish. Discuss this issue in detail with your allergist to make sure the appropriate food restrictions are implemented.\n\n> About 60 percent of people with shellfish allergy experience their first allergic reaction as adults.3\n\nLiving With Shellfish Allergy\n\n[Allergic Reactions to Shellfish](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n\nShellfish can cause severe and potentially life-threatening allergic reactions (such as anaphylaxis). Allergic reactions can be unpredictable, and even very small amounts of shellfish can cause one.\n\nIf you have a shellfish allergy, keep an epinephrine delivery device with you at all times. Epinephrine is the first-line treatment for anaphylaxis.\n\n[Avoiding Shellfish](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n\nTo prevent a reaction, it is very important to avoid all shellfish and shellfish products. Always read food labels and ask questions about ingredients before eating a food that you have not prepared yourself.\n\nMost people who are allergic to one group of shellfish are allergic to other types. Your allergist will usually recommend you avoid all kinds of shellfish. If you are allergic to a specific type of shellfish but want to eat other shellfish, talk to your doctor about further allergy testing.\n\nSteer clear of seafood restaurants, where there is a high risk of food cross-contact. You should also avoid touching shellfish and going to fish markets. Being in any area where shellfish are being cooked can put you at risk, as shellfish protein could be in the steam.\n\nCrustacean shellfish are one of the eight major allergens that must be listed in plain language on packaged foods sold in the U.S., as required by federal law, either within the ingredient list or in a separate “Contains” statement on the package. For crustacean shellfish, the specific variety must also be identified on the package such as crab or shrimp.\n\nMollusks are not required to be labeled in the U.S. at this time and may be present in a food item unexpectedly.\n\n**Avoid foods that contain shellfish or any of these ingredients:**\n\n- Barnacle\n- Crab\n- Crawfish (crawdad, crayfish, ecrevisse)\n- Krill\n- Lobster (langouste, langoustine, Moreton bay bugs, scampi, tomalley)\n- Prawns\n- Shrimp (crevette, scampi)\n\n**Your doctor may advise you to avoid mollusks\\* or these ingredients:**\n\n- Abalone\n- Clams (cherrystone, geoduck, littleneck, pismo, quahog)\n- Cockle\n- Cuttlefish\n- Limpet (lapas, opihi)\n- Mussels\n- Octopus\n- Oysters\n- Periwinkle\n- Sea cucumber\n- Sea urchin\n- Scallops\n- Snails (escargot)\n- Squid (calamari)\n- Whelk (Turban shell)\n\n*\\*Note: The federal government does not require mollusks to be fully disclosed on product labels.*\n\n**Shellfish are sometimes found in the following:**\n\n- Bouillabaisse\n- Cuttlefish ink\n- Glucosamine\n- Fish stock\n- Seafood flavoring (e.g., crab or clam extract)\n- Fish stock or fish sauce (sometimes made from krill)\n- Surimi\n\n[What About Carrageenan or Iodine?](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/common-allergens\/shellfish)\n\nCarrageenan, or \"Irish moss,” is not shellfish. It is a red marine algae used as an emulsifier, stabilizer and thickener in many foods like dairy foods. It is safe for most people with food allergies.\n\nShellfish allergy is sometimes confused with iodine allergy because shellfish is known to contain the element iodine. But iodine is not what triggers the reaction in people who are allergic to shellfish. The major allergen in shellfish is a muscle protein called tropomyosin and this is what is responsible for causing the allergic reaction. If you have a shellfish allergy, you do not need to worry about cross-reactions with iodine or radiocontrast material (which can contain iodine and is used in some radiographic medical procedures).\n\n## Featured Resources\n[Avoiding Cross-Contact](https:\/\/www.foodallergy.org\/resources\/avoiding-cross-contact)\n\nEducation\n\n[Anaphylaxis](https:\/\/www.foodallergy.org\/resources\/anaphylaxis)\n\nEducation\n\n[Epinephrine Options and Training](https:\/\/www.foodallergy.org\/resources\/epinephrine-options-and-training)\n\nEpinephrine\n\n[Tips for Avoiding Your Allergens (PDF)](https:\/\/www.foodallergy.org\/resources\/tips-avoiding-your-allergens-pdf)\n\nEducation\n\n[Food Allergy 101](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/food-allergy-101)\n\n![Kid holding heart](https:\/\/www.foodallergy.org\/sites\/default\/files\/styles\/461x299\/public\/2020-01\/Untitled%20design%20%2847%29.png?h=0c570c8c&itok=f8Zbx-GO)\n\n## Food Allergy & Anaphylaxis Emergency Care Plan\nGet to know this document, the cornerstone of personalized treatment for anyone with a food allergy.\n\n[Learn More](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/food-allergy-anaphylaxis-emergency-care-plan)\n\n## Your food allergy story powers research that changes lives.\nJoin the FARE Patient Registry® - making a difference is easy and confidential.\n\n[Join Patient Registry](https:\/\/www.foodallergy.org\/research-innovation\/elevating-research\/fare-patient-registry)\n\n## The Latest Allergen Alerts\n### [Egg, Tree Nut, Soy Allergy Alert: Blueroot Health](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/allergy-alerts\/egg-tree-nut-soy-allergy-alert-blueroot)\nApril 10, 2026\n\n### [Sesame Allergy Alert: Sky Ranch Meat LLC](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/allergy-alerts\/sesame-allergy-alert-sky-ranch-meat-llc)\nApril 09, 2026\n\n### [Milk Allergy Alert: Wawa](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/allergy-alerts\/milk-allergy-alert-wawa)\nApril 03, 2026\n\n[See All Alerts](https:\/\/www.foodallergy.org\/living-food-allergy\/food-allergy-essentials\/allergy-alerts)\n\n1Sicherer SH, et al. Prevalence of seafood allergy in the United States determined by a random telephone survey. J Allergy Clin Immunol 2004;114:159.\n\n![FARE - Food Allergy Research & Education Logo](https:\/\/www.foodallergy.org\/themes\/custom\/fare\/assets\/images\/logo-fare-stacked-white.svg)\n\nAbout FARE\n\nFARE (Food Allergy Research & Education) is a 501(c)(3) charitable organization with the mission to improve the quality of life and health of those with food allergy through transformative research, education, and advocacy.\n\n[Read More](https:\/\/www.foodallergy.org\/about-us)\n\n- [Twitter](https:\/\/twitter.com\/FoodAllergy)\n- [Facebook](https:\/\/www.facebook.com\/FoodAllergyFARE)\n- [Instagram](https:\/\/www.instagram.com\/foodallergy\/)\n- [LinkedIn](https:\/\/www.linkedin.com\/company\/fareorg\/)\n- [YouTube](https:\/\/www.youtube.com\/c\/livingtealchannel)\n- [TikTok](https:\/\/www.tiktok.com\/@foodallergyfare)\n\n- [Contact Us](https:\/\/www.foodallergy.org\/contact-us)\n- [Careers](https:\/\/www.foodallergy.org\/careers)\n\n[![CHARITY NAVIGATOR - Four Star Charity Image](https:\/\/www.foodallergy.org\/themes\/custom\/fare\/assets\/images\/charity_nav_bw.png)](https:\/\/www.charitynavigator.org\/ein\/133905508)   [![Candid Seal](https:\/\/widgets.guidestar.org\/prod\/v1\/pdp\/transparency-seal\/6926205\/svg)](https:\/\/app.candid.org\/profile\/6926205)\n\n© 2026 FARE (Tax ID: 13-3905508) is a charitable organization as described in section 501(c)(3) of the Internal Revenue Code.\n\n- [Terms of Use](https:\/\/www.foodallergy.org\/terms-use)\n- [Digital Policy](https:\/\/www.foodallergy.org\/privacy-policy)\n\nWe use cookies to deliver the best possible experience on our website. To learn more, visit our [Privacy Policy](https:\/\/www.foodallergy.org\/privacy-policy). By continuing to use this site, or closing this box, you consent to our use of cookies.\n\nClose\n\n## FARE Resources\nPlease complete the following form to download the resource. You will be opted into FARE communications and can manage your preferences in the footer of any FARE email.\n\n## Top 9 Allergen Free Thanksgiving Cookbook\nDownload these tasty allergy friendly Thanksgiving recipes for you and your family to make and enjoy! You will be opted into FARE communications and can manage your preferences in the footer of any FARE email.\n\n## Back to School Posters\nPlease complete the following form to download the poster. You will be opted into FARE communications and can manage your preferences in the footer of any FARE email.\n\n## FARE Food Allergy Patient Toolkit\nPlease complete the following form to download the FARE Food Allergy Patient Toolkit. You will be opted into FARE communications and can manage your preferences in the footer of any FARE email.\n\n## Newark Workshop Videos Access\nComplete this form to view the recordings from the workshop. You will be opted into FARE communications and can manage your preferences in the footer of any FARE email.\n\n## Holiday Recipe Book\nDownload these tasty holiday recipes for you and your family to make and enjoy! You will be opted into FARE communications and can manage your preferences in the footer of any FARE email.","attrs_readable_markdown":"## What Is Shellfish Allergy?\nShellfish allergies are the most common food allergies in adults and among the most common food allergies in children. Approximately 2% of the U.S. population reports an allergy to shellfish.1 Shellfish allergies are usually lifelong.\n\nWhen a person with an allergy to a particular shellfish is exposed to that shellfish, proteins in the shellfish bind to specific IgE antibodies made by the person’s immune system. This triggers the person’s immune defenses, leading to reaction symptoms that can be mild or very severe.\n\nThere are two groups of shellfish: crustaceans (such as shrimp, prawns, crab and lobster) and mollusks\/bivalves (such as clams, mussels, oysters, scallops, octopus, squid, abalone, snail). Allergy to crustaceans is more common than allergy to mollusks, with shrimp being the most common shellfish allergen for both children and adults.\n\nFinned fish and shellfish are not closely related. Being allergic to one does not always mean that you must avoid both, though care is needed to prevent cross-contact between fish and shellfish. Discuss this issue in detail with your allergist to make sure the appropriate food restrictions are implemented.\n\n> About 60 percent of people with shellfish allergy experience their first allergic reaction as adults.3\n\n1Sicherer SH, et al. Prevalence of seafood allergy in the United States determined by a random telephone survey. J Allergy Clin Immunol 2004;114:159.","meta_canonical":null}

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Boilerpipe Text	What Is Shellfish Allergy? Shellfish allergies are the most common food allergies in adults and among the most common food allergies in children. Approximately 2% of the U.S. population reports an allergy to shellfish. 1 Shellfish allergies are usually lifelong. When a person with an allergy to a particular shellfish is exposed to that shellfish, proteins in the shellfish bind to specific IgE antibodies made by the person’s immune system. This triggers the person’s immune defenses, leading to reaction symptoms that can be mild or very severe. There are two groups of shellfish: crustaceans (such as shrimp, prawns, crab and lobster) and mollusks/bivalves (such as clams, mussels, oysters, scallops, octopus, squid, abalone, snail). Allergy to crustaceans is more common than allergy to mollusks, with shrimp being the most common shellfish allergen for both children and adults. Finned fish and shellfish are not closely related. Being allergic to one does not always mean that you must avoid both, though care is needed to prevent cross-contact between fish and shellfish. Discuss this issue in detail with your allergist to make sure the appropriate food restrictions are implemented. About 60 percent of people with shellfish allergy experience their first allergic reaction as adults. 3 1 Sicherer SH, et al. Prevalence of seafood allergy in the United States determined by a random telephone survey. J Allergy Clin Immunol 2004;114:159.
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[Fish](https://www.foodallergy.org/living-food-allergies/food-allergy-essentials/common-allergens/fish) - [Milk](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/milk) - [Peanut](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/peanut) - [Sesame](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/sesame) - [Shellfish](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) - [Soy](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/soy) - [Tree Nut](https://www.foodallergy.org/living-food-allergies/food-allergy-essentials/common-allergens/tree-nut) - [Wheat](https://www.foodallergy.org/living-food-allergies/food-allergy-essentials/common-allergens/wheat) - [Other Food Allergies](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/other-food-allergens) - [Substitutions](https://www.foodallergy.org/living-food-allergies/food-allergy-essentials/common-allergens/substitutions) - [Tips for Avoiding Your Allergen](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/tips-avoiding-your-allergen) Close Menu - Shellfish SHARE [Facebook](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) [Twitter](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) [Email](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) [LinkedIn](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) SHARE CLOSE [Facebook](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) [Twitter](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) [Email](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) [LinkedIn](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) # Shellfish Allergy ## What Is Shellfish Allergy? Shellfish allergies are the most common food allergies in adults and among the most common food allergies in children. Approximately 2% of the U.S. population reports an allergy to shellfish.1 Shellfish allergies are usually lifelong. When a person with an allergy to a particular shellfish is exposed to that shellfish, proteins in the shellfish bind to specific IgE antibodies made by the person’s immune system. This triggers the person’s immune defenses, leading to reaction symptoms that can be mild or very severe. There are two groups of shellfish: crustaceans (such as shrimp, prawns, crab and lobster) and mollusks/bivalves (such as clams, mussels, oysters, scallops, octopus, squid, abalone, snail). Allergy to crustaceans is more common than allergy to mollusks, with shrimp being the most common shellfish allergen for both children and adults. Finned fish and shellfish are not closely related. Being allergic to one does not always mean that you must avoid both, though care is needed to prevent cross-contact between fish and shellfish. Discuss this issue in detail with your allergist to make sure the appropriate food restrictions are implemented. > About 60 percent of people with shellfish allergy experience their first allergic reaction as adults.3 Living With Shellfish Allergy [Allergic Reactions to Shellfish](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) Shellfish can cause severe and potentially life-threatening allergic reactions (such as anaphylaxis). Allergic reactions can be unpredictable, and even very small amounts of shellfish can cause one. If you have a shellfish allergy, keep an epinephrine delivery device with you at all times. Epinephrine is the first-line treatment for anaphylaxis. [Avoiding Shellfish](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) To prevent a reaction, it is very important to avoid all shellfish and shellfish products. Always read food labels and ask questions about ingredients before eating a food that you have not prepared yourself. Most people who are allergic to one group of shellfish are allergic to other types. Your allergist will usually recommend you avoid all kinds of shellfish. If you are allergic to a specific type of shellfish but want to eat other shellfish, talk to your doctor about further allergy testing. Steer clear of seafood restaurants, where there is a high risk of food cross-contact. You should also avoid touching shellfish and going to fish markets. Being in any area where shellfish are being cooked can put you at risk, as shellfish protein could be in the steam. Crustacean shellfish are one of the eight major allergens that must be listed in plain language on packaged foods sold in the U.S., as required by federal law, either within the ingredient list or in a separate “Contains” statement on the package. For crustacean shellfish, the specific variety must also be identified on the package such as crab or shrimp. Mollusks are not required to be labeled in the U.S. at this time and may be present in a food item unexpectedly. Avoid foods that contain shellfish or any of these ingredients: - Barnacle - Crab - Crawfish (crawdad, crayfish, ecrevisse) - Krill - Lobster (langouste, langoustine, Moreton bay bugs, scampi, tomalley) - Prawns - Shrimp (crevette, scampi) *Your doctor may advise you to avoid mollusks\ or these ingredients:** - Abalone - Clams (cherrystone, geoduck, littleneck, pismo, quahog) - Cockle - Cuttlefish - Limpet (lapas, opihi) - Mussels - Octopus - Oysters - Periwinkle - Sea cucumber - Sea urchin - Scallops - Snails (escargot) - Squid (calamari) - Whelk (Turban shell) \Note: The federal government does not require mollusks to be fully disclosed on product labels.* Shellfish are sometimes found in the following: - Bouillabaisse - Cuttlefish ink - Glucosamine - Fish stock - Seafood flavoring (e.g., crab or clam extract) - Fish stock or fish sauce (sometimes made from krill) - Surimi [What About Carrageenan or Iodine?](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/common-allergens/shellfish) Carrageenan, or "Irish moss,” is not shellfish. It is a red marine algae used as an emulsifier, stabilizer and thickener in many foods like dairy foods. It is safe for most people with food allergies. Shellfish allergy is sometimes confused with iodine allergy because shellfish is known to contain the element iodine. But iodine is not what triggers the reaction in people who are allergic to shellfish. The major allergen in shellfish is a muscle protein called tropomyosin and this is what is responsible for causing the allergic reaction. If you have a shellfish allergy, you do not need to worry about cross-reactions with iodine or radiocontrast material (which can contain iodine and is used in some radiographic medical procedures). ## Featured Resources [Avoiding Cross-Contact](https://www.foodallergy.org/resources/avoiding-cross-contact) Education [Anaphylaxis](https://www.foodallergy.org/resources/anaphylaxis) Education [Epinephrine Options and Training](https://www.foodallergy.org/resources/epinephrine-options-and-training) Epinephrine [Tips for Avoiding Your Allergens (PDF)](https://www.foodallergy.org/resources/tips-avoiding-your-allergens-pdf) Education [Food Allergy 101](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/food-allergy-101) ![Kid holding heart](https://www.foodallergy.org/sites/default/files/styles/461x299/public/2020-01/Untitled%20design%20%2847%29.png?h=0c570c8c&itok=f8Zbx-GO) ## Food Allergy & Anaphylaxis Emergency Care Plan Get to know this document, the cornerstone of personalized treatment for anyone with a food allergy. [Learn More](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/food-allergy-anaphylaxis-emergency-care-plan) ## Your food allergy story powers research that changes lives. Join the FARE Patient Registry® - making a difference is easy and confidential. [Join Patient Registry](https://www.foodallergy.org/research-innovation/elevating-research/fare-patient-registry) ## The Latest Allergen Alerts ### [Egg, Tree Nut, Soy Allergy Alert: Blueroot Health](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/allergy-alerts/egg-tree-nut-soy-allergy-alert-blueroot) April 10, 2026 ### [Sesame Allergy Alert: Sky Ranch Meat LLC](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/allergy-alerts/sesame-allergy-alert-sky-ranch-meat-llc) April 09, 2026 ### [Milk Allergy Alert: Wawa](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/allergy-alerts/milk-allergy-alert-wawa) April 03, 2026 [See All Alerts](https://www.foodallergy.org/living-food-allergy/food-allergy-essentials/allergy-alerts) 1Sicherer SH, et al. Prevalence of seafood allergy in the United States determined by a random telephone survey. 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Readable Markdown	## What Is Shellfish Allergy? Shellfish allergies are the most common food allergies in adults and among the most common food allergies in children. Approximately 2% of the U.S. population reports an allergy to shellfish.1 Shellfish allergies are usually lifelong. When a person with an allergy to a particular shellfish is exposed to that shellfish, proteins in the shellfish bind to specific IgE antibodies made by the person’s immune system. This triggers the person’s immune defenses, leading to reaction symptoms that can be mild or very severe. There are two groups of shellfish: crustaceans (such as shrimp, prawns, crab and lobster) and mollusks/bivalves (such as clams, mussels, oysters, scallops, octopus, squid, abalone, snail). Allergy to crustaceans is more common than allergy to mollusks, with shrimp being the most common shellfish allergen for both children and adults. Finned fish and shellfish are not closely related. Being allergic to one does not always mean that you must avoid both, though care is needed to prevent cross-contact between fish and shellfish. Discuss this issue in detail with your allergist to make sure the appropriate food restrictions are implemented. > About 60 percent of people with shellfish allergy experience their first allergic reaction as adults.3 1Sicherer SH, et al. Prevalence of seafood allergy in the United States determined by a random telephone survey. J Allergy Clin Immunol 2004;114:159.
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