🕷️ Crawler Inspector

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Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 71 (from laksa080)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa071.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://authors.library.caltech.edu/records/0mjqz-64458\')), getAhrefsUnparsedNoserviceFromURL(\'https://authors.library.caltech.edu/records/0mjqz-64458\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458","crawl_time":1770496743,"first_indexed_time":1700275808,"http_code":200,"src_unparsed":"edu,caltech!library,authors,\/records\/0mjqz-64458 s443","src_root_hash":"9475656135030775671","history_drop_reason":null,"meta_title":"Laboratory Evaluation Links Some False-Positive COVID-19 Antigen Test Results Observed in a Field Study to a Specific Lot of Test Strips","meta_descriptions":["During a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results."],"attrs_boilerpipe_text":"Published January 30, 2023\n| Version Published + Supplemental Material\nJournal Article\nOpen\n1.\nCalifornia Institute of Technology\nAbstract\nDuring a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results.\nAdditional Information\n© The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America.\nThis is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. \n\nWe thank the study participants for making this work possible. We thank Study Coordinators Saharai Caldera for suggesting the laboratory evaluation and both Saharai and Hannah Davich for removing lot 152000 from circulation in the study. We thank Taikun Yamada, John Raymond B. Reyna, Paolo Piatti and Yap Ching Chew for performing and verifying the validity of RT-qPCR results as previously reported. Finally, we thank all the case investigators and contact tracers at the Pasadena Public Health Department and Caltech Student Wellness Services for their efforts in study recruitment and their work in the pandemic response. \n\nThis work was supported by the Ronald and Maxine Linde Center for New Initiatives at the California Institute of Technology and the Jacobs Institute for Molecular Engineering for Medicine at the California Institute of Technology. A UCLA DGSOM Geffen Fellowship to AVW. \n\nData Availability: The data underlying the results presented in the study are available at CaltechDATA at: https:\/\/doi.org\/10.22002\/fmz6a-0x036.\n\nAlyssa M. Carter and Alexander Viloria Winnett contributed equally to this manuscript.\nAttached Files\nPublished -\nofac701.pdf\nSupplemental Material -\nofac701_supplementary_data.pdf\nFiles\nofac701.pdf\nFiles\n(507.3 kB)\nName\nSize\nofac701.pdf\nmd5:2c1716cccecfe2021915a6e0f123c979\n337.9 kB\nPreview\nDownload\nofac701_supplementary_data.pdf\nmd5:f3101239a9d910c5dccc5ed24b5c9ac1\n169.5 kB\nPreview\nDownload\nAdditional details\nPMC9887260\n118971\nCaltechAUTHORS:20230130-263514000.2\n2023-01-30\nCreated from EPrint's datestamp field\n2023-07-05\nCreated from EPrint's last_modified field\nCOVID-19, \n    \n      Jacobs Institute for Molecular Engineering for Medicine, \n    \n      Division of Biology and Biological Engineering (BBE)","attrs_markdown":"[Skip to main](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458#main)\n\n[![CaltechAUTHORS](https:\/\/authors.library.caltech.edu\/static\/images\/CaltechAUTHORS-by-Caltech-Library-blue-with-padding.svg)](https:\/\/authors.library.caltech.edu\/)\n\n[Communities](https:\/\/authors.library.caltech.edu\/communities)\n\n[My dashboard](https:\/\/authors.library.caltech.edu\/me\/uploads)\n\n![](https:\/\/authors.library.caltech.edu\/api\/communities\/aedd135f-227e-4fdf-9476-5b3fd011bac6\/logo)\n\n[CaltechAUTHORS](https:\/\/authors.library.caltech.edu\/communities\/caltechauthors\/records)\n\nPublished January 30, 2023   \\| Version Published + Supplemental Material\n\nJournal Article     Open\n\n# Laboratory Evaluation Links Some False-Positive COVID-19 Antigen Test Results Observed in a Field Study to a Specific Lot of Test Strips\n### Creators\n- [Carter, Alyssa M.1](https:\/\/authors.library.caltech.edu\/search?q=metadata.creators.person_or_org.name:%22Carter,+Alyssa+M.%22)  [![ORCID icon](https:\/\/authors.library.caltech.edu\/static\/images\/orcid.svg)](https:\/\/orcid.org\/0000-0002-2776-9421 \"Carter, Alyssa M.'s ORCID profile\")\n- [Winnett, Alexander Viloria1](https:\/\/authors.library.caltech.edu\/search?q=metadata.creators.person_or_org.name:%22Winnett,+Alexander+Viloria%22)  [![ORCID icon](https:\/\/authors.library.caltech.edu\/static\/images\/orcid.svg)](https:\/\/orcid.org\/0000-0002-7338-5605 \"Winnett, Alexander Viloria's ORCID profile\")\n- [Romano, Anna E.1](https:\/\/authors.library.caltech.edu\/search?q=metadata.creators.person_or_org.name:%22Romano,+Anna+E.%22)  [![ORCID icon](https:\/\/authors.library.caltech.edu\/static\/images\/orcid.svg)](https:\/\/orcid.org\/0000-0002-7148-0668 \"Romano, Anna E.'s ORCID profile\")\n- [Akana, Reid1](https:\/\/authors.library.caltech.edu\/search?q=metadata.creators.person_or_org.name:%22Akana,+Reid%22)  [![ORCID icon](https:\/\/authors.library.caltech.edu\/static\/images\/orcid.svg)](https:\/\/orcid.org\/0000-0003-4422-587X \"Akana, Reid's ORCID profile\")\n- [Shelby, Natasha1](https:\/\/authors.library.caltech.edu\/search?q=metadata.creators.person_or_org.name:%22Shelby,+Natasha%22)  [![ORCID icon](https:\/\/authors.library.caltech.edu\/static\/images\/orcid.svg)](https:\/\/orcid.org\/0000-0001-9097-3663 \"Shelby, Natasha's ORCID profile\")\n- [Ismagilov, Rustem F.1](https:\/\/authors.library.caltech.edu\/search?q=metadata.creators.person_or_org.name:%22Ismagilov,+Rustem+F.%22)  [![ORCID icon](https:\/\/authors.library.caltech.edu\/static\/images\/orcid.svg)](https:\/\/orcid.org\/0000-0002-3680-4399 \"Ismagilov, Rustem F.'s ORCID profile\")\n\nShow affiliations\n\n- 1\\.  [![ROR icon](https:\/\/authors.library.caltech.edu\/static\/images\/ror-icon.svg)](https:\/\/ror.org\/05dxps055 \"California Institute of Technology's ROR profile\")  California Institute of Technology\n\n## Abstract\nDuring a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results.\n\n## Additional Information\n© The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. We thank the study participants for making this work possible. We thank Study Coordinators Saharai Caldera for suggesting the laboratory evaluation and both Saharai and Hannah Davich for removing lot 152000 from circulation in the study. We thank Taikun Yamada, John Raymond B. Reyna, Paolo Piatti and Yap Ching Chew for performing and verifying the validity of RT-qPCR results as previously reported. Finally, we thank all the case investigators and contact tracers at the Pasadena Public Health Department and Caltech Student Wellness Services for their efforts in study recruitment and their work in the pandemic response. This work was supported by the Ronald and Maxine Linde Center for New Initiatives at the California Institute of Technology and the Jacobs Institute for Molecular Engineering for Medicine at the California Institute of Technology. A UCLA DGSOM Geffen Fellowship to AVW. Data Availability: The data underlying the results presented in the study are available at CaltechDATA at: https:\/\/doi.org\/10.22002\/fmz6a-0x036. Alyssa M. Carter and Alexander Viloria Winnett contributed equally to this manuscript.\n\n## Attached Files\nPublished - [ofac701.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701.pdf?download=1)\n\nSupplemental Material - [ofac701\\_supplementary\\_data.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701_supplementary_data.pdf?download=1)\n\n## Files\n### ofac701.pdf\n### Files (507.3 kB)\n| Name | Size |   |\n|---|---|---|\n| [ofac701.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701.pdf?download=1) md5:2c1716cccecfe2021915a6e0f123c979 | 337\\.9 kB | [Preview](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/preview\/ofac701.pdf?include_deleted=0)   [Download](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701.pdf?download=1) |\n| [ofac701\\_supplementary\\_data.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701_supplementary_data.pdf?download=1) md5:f3101239a9d910c5dccc5ed24b5c9ac1 | 169\\.5 kB | [Preview](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/preview\/ofac701_supplementary_data.pdf?include_deleted=0)   [Download](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701_supplementary_data.pdf?download=1) |\n\n## Additional details\n### Identifiers\nPMCID\n\n[PMC9887260](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/PMC9887260 \"Opens in new tab\")\n\nEprint ID\n\n118971\n\nResolver ID\n\nCaltechAUTHORS:20230130-263514000.2\n\n### Related works\nDescribes\n\n[10\\.22002\/fmz6a-0x036](https:\/\/doi.org\/10.22002\/fmz6a-0x036 \"Opens in new tab\")  (DOI)\n\n### Funding\nRonald and Maxine Linde Center for New Initiatives\n\nJacobs Institute for Molecular Engineering for Medicine\n\nUCLA\n\n### Dates\nCreated\n\n2023-01-30\n\nCreated from EPrint's datestamp field\n\nUpdated\n\n2023-07-05\n\nCreated from EPrint's last\\_modified field\n\n### Caltech Custom Metadata\nCaltech groups\n\nCOVID-19, Jacobs Institute for Molecular Engineering for Medicine, Division of Biology and Biological Engineering (BBE)\n\n62\n\nViews\n\n44\n\nDownloads\n\nShow more details\n\n|   | All versions | This version |\n|---|---|---|\n| Views  Total views | 62 | 62 |\n| Downloads  Total downloads | 44 | 44 |\n| Data volume  Total data volume | 13\\.4 MB | 13\\.4 MB |\n\n[More info on how stats are collected....](https:\/\/authors.library.caltech.edu\/help\/statistics)\n## Versions\n## Keywords and subjects\n### Keywords\n- [Infectious Diseases](https:\/\/authors.library.caltech.edu\/search?q=metadata.subjects.subject:%22Infectious+Diseases%22 \"Search results for Infectious Diseases\")\n- [Oncology](https:\/\/authors.library.caltech.edu\/search?q=metadata.subjects.subject:%22Oncology%22 \"Search results for Oncology\")\n\n## Details\nDOI\n\n![10\\.1093\/ofid\/ofac701](https:\/\/authors.library.caltech.edu\/badge\/DOI\/10.1093\/ofid\/ofac701.svg)\n\nDOI Badge\n\n#### DOI\n####\n### Markdown\n```\n[![DOI](https:\/\/authors.library.caltech.edu\/badge\/DOI\/10.1093\/ofid\/ofac701.svg)](https:\/\/doi.org\/10.1093\/ofid\/ofac701)\n```\n### reStructuredText\n```\n.. image:: https:\/\/authors.library.caltech.edu\/badge\/DOI\/10.1093\/ofid\/ofac701.svg\n  :target: https:\/\/doi.org\/10.1093\/ofid\/ofac701\n```\n### HTML\n```\n<a href=\"https:\/\/doi.org\/10.1093\/ofid\/ofac701\"><img src=\"https:\/\/authors.library.caltech.edu\/badge\/DOI\/10.1093\/ofid\/ofac701.svg\" alt=\"DOI\"><\/a>\n```\n### Image URL\n```\nhttps:\/\/authors.library.caltech.edu\/badge\/DOI\/10.1093\/ofid\/ofac701.svg\n```\n### Target URL\n```\nhttps:\/\/doi.org\/10.1093\/ofid\/ofac701\n```\n\nResource type\n\nJournal Article\n\nPublisher\n\nOxford University Press\n\nPublished in\n\nOpen Forum Infectious Diseases, 10(1), Art. No. ofac701, ISSN: 2328-8957, 2023.\n\n## Rights\n#### License\n- Other\n  No commercial reproduction, distribution, display or performance rights in this work are provided.\n## Communities\n## Export\n## Technical metadata\nCreated\n\nAugust 22, 2023\n\nModified\n\nNovember 22, 2025\n\nJump up\n\n[About](https:\/\/library.caltech.edu\/c.php?g=512684&p=11281171) [Policies](https:\/\/library.caltech.edu\/c.php?g=512684&p=11281170) [Help](https:\/\/library.caltech.edu\/c.php?g=512684&p=11207017) [Powered by InvenioRDM](https:\/\/inveniosoftware.org\/products\/rdm)","attrs_readable_markdown":"Published January 30, 2023   \\| Version Published + Supplemental Material\n\nJournal Article     Open\n\n- 1\\.  [![ROR icon](https:\/\/authors.library.caltech.edu\/static\/images\/ror-icon.svg)](https:\/\/ror.org\/05dxps055 \"California Institute of Technology's ROR profile\")  California Institute of Technology\n\n## Abstract\nDuring a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results.\n\n## Additional Information\n© The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. We thank the study participants for making this work possible. We thank Study Coordinators Saharai Caldera for suggesting the laboratory evaluation and both Saharai and Hannah Davich for removing lot 152000 from circulation in the study. We thank Taikun Yamada, John Raymond B. Reyna, Paolo Piatti and Yap Ching Chew for performing and verifying the validity of RT-qPCR results as previously reported. Finally, we thank all the case investigators and contact tracers at the Pasadena Public Health Department and Caltech Student Wellness Services for their efforts in study recruitment and their work in the pandemic response. This work was supported by the Ronald and Maxine Linde Center for New Initiatives at the California Institute of Technology and the Jacobs Institute for Molecular Engineering for Medicine at the California Institute of Technology. A UCLA DGSOM Geffen Fellowship to AVW. Data Availability: The data underlying the results presented in the study are available at CaltechDATA at: https:\/\/doi.org\/10.22002\/fmz6a-0x036. Alyssa M. Carter and Alexander Viloria Winnett contributed equally to this manuscript.\n\n## Attached Files\nPublished - [ofac701.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701.pdf?download=1)\n\nSupplemental Material - [ofac701\\_supplementary\\_data.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701_supplementary_data.pdf?download=1)\n\n## Files\n### ofac701.pdf\n### Files (507.3 kB)\n| Name | Size |   |\n|---|---|---|\n| [ofac701.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701.pdf?download=1) md5:2c1716cccecfe2021915a6e0f123c979 | 337\\.9 kB | [Preview](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/preview\/ofac701.pdf?include_deleted=0)   [Download](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701.pdf?download=1) |\n| [ofac701\\_supplementary\\_data.pdf](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701_supplementary_data.pdf?download=1) md5:f3101239a9d910c5dccc5ed24b5c9ac1 | 169\\.5 kB | [Preview](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/preview\/ofac701_supplementary_data.pdf?include_deleted=0)   [Download](https:\/\/authors.library.caltech.edu\/records\/0mjqz-64458\/files\/ofac701_supplementary_data.pdf?download=1) |\n\n## Additional details\n[PMC9887260](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/PMC9887260 \"Opens in new tab\")\n\n118971\n\nCaltechAUTHORS:20230130-263514000.2\n\n2023-01-30\n\nCreated from EPrint's datestamp field\n\n2023-07-05\n\nCreated from EPrint's last\\_modified field\n\nCOVID-19, Jacobs Institute for Molecular Engineering for Medicine, Division of Biology and Biological Engineering (BBE)","meta_canonical":null}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📄

INDEXABLE

✅

CRAWLED

2 months ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	2.2 months ago
History drop	PASS	`isNull(history_drop_reason)`	No drop reason
Spam/ban	PASS	`fh_dont_index != 1 AND ml_spam_score = 0`	ml_spam_score=0
Canonical	PASS	`meta_canonical IS NULL OR = '' OR = src_unparsed`	Not set

Page Details

Property	Value
URL	https://authors.library.caltech.edu/records/0mjqz-64458
Last Crawled	2026-02-07 20:39:03 (2 months ago)
First Indexed	2023-11-18 02:50:08 (2 years ago)
HTTP Status Code	200
Meta Title	Laboratory Evaluation Links Some False-Positive COVID-19 Antigen Test Results Observed in a Field Study to a Specific Lot of Test Strips
Meta Description	During a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results.
Meta Canonical	null
Boilerpipe Text	Published January 30, 2023 \| Version Published + Supplemental Material Journal Article Open 1. California Institute of Technology Abstract During a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results. Additional Information © The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. We thank the study participants for making this work possible. We thank Study Coordinators Saharai Caldera for suggesting the laboratory evaluation and both Saharai and Hannah Davich for removing lot 152000 from circulation in the study. We thank Taikun Yamada, John Raymond B. Reyna, Paolo Piatti and Yap Ching Chew for performing and verifying the validity of RT-qPCR results as previously reported. Finally, we thank all the case investigators and contact tracers at the Pasadena Public Health Department and Caltech Student Wellness Services for their efforts in study recruitment and their work in the pandemic response. This work was supported by the Ronald and Maxine Linde Center for New Initiatives at the California Institute of Technology and the Jacobs Institute for Molecular Engineering for Medicine at the California Institute of Technology. A UCLA DGSOM Geffen Fellowship to AVW. Data Availability: The data underlying the results presented in the study are available at CaltechDATA at: https://doi.org/10.22002/fmz6a-0x036. Alyssa M. Carter and Alexander Viloria Winnett contributed equally to this manuscript. Attached Files Published - ofac701.pdf Supplemental Material - ofac701_supplementary_data.pdf Files ofac701.pdf Files (507.3 kB) Name Size ofac701.pdf md5:2c1716cccecfe2021915a6e0f123c979 337.9 kB Preview Download ofac701_supplementary_data.pdf md5:f3101239a9d910c5dccc5ed24b5c9ac1 169.5 kB Preview Download Additional details PMC9887260 118971 CaltechAUTHORS:20230130-263514000.2 2023-01-30 Created from EPrint's datestamp field 2023-07-05 Created from EPrint's last_modified field COVID-19, Jacobs Institute for Molecular Engineering for Medicine, Division of Biology and Biological Engineering (BBE)
Markdown	[Skip to main](https://authors.library.caltech.edu/records/0mjqz-64458#main) [![CaltechAUTHORS](https://authors.library.caltech.edu/static/images/CaltechAUTHORS-by-Caltech-Library-blue-with-padding.svg)](https://authors.library.caltech.edu/) [Communities](https://authors.library.caltech.edu/communities) [My dashboard](https://authors.library.caltech.edu/me/uploads) ![](https://authors.library.caltech.edu/api/communities/aedd135f-227e-4fdf-9476-5b3fd011bac6/logo) [CaltechAUTHORS](https://authors.library.caltech.edu/communities/caltechauthors/records) Published January 30, 2023 \\| Version Published + Supplemental Material Journal Article Open # Laboratory Evaluation Links Some False-Positive COVID-19 Antigen Test Results Observed in a Field Study to a Specific Lot of Test Strips ### Creators - [Carter, Alyssa M.1](https://authors.library.caltech.edu/search?q=metadata.creators.person_or_org.name:%22Carter,+Alyssa+M.%22) [![ORCID icon](https://authors.library.caltech.edu/static/images/orcid.svg)](https://orcid.org/0000-0002-2776-9421 "Carter, Alyssa M.'s ORCID profile") - [Winnett, Alexander Viloria1](https://authors.library.caltech.edu/search?q=metadata.creators.person_or_org.name:%22Winnett,+Alexander+Viloria%22) [![ORCID icon](https://authors.library.caltech.edu/static/images/orcid.svg)](https://orcid.org/0000-0002-7338-5605 "Winnett, Alexander Viloria's ORCID profile") - [Romano, Anna E.1](https://authors.library.caltech.edu/search?q=metadata.creators.person_or_org.name:%22Romano,+Anna+E.%22) [![ORCID icon](https://authors.library.caltech.edu/static/images/orcid.svg)](https://orcid.org/0000-0002-7148-0668 "Romano, Anna E.'s ORCID profile") - [Akana, Reid1](https://authors.library.caltech.edu/search?q=metadata.creators.person_or_org.name:%22Akana,+Reid%22) [![ORCID icon](https://authors.library.caltech.edu/static/images/orcid.svg)](https://orcid.org/0000-0003-4422-587X "Akana, Reid's ORCID profile") - [Shelby, Natasha1](https://authors.library.caltech.edu/search?q=metadata.creators.person_or_org.name:%22Shelby,+Natasha%22) [![ORCID icon](https://authors.library.caltech.edu/static/images/orcid.svg)](https://orcid.org/0000-0001-9097-3663 "Shelby, Natasha's ORCID profile") - [Ismagilov, Rustem F.1](https://authors.library.caltech.edu/search?q=metadata.creators.person_or_org.name:%22Ismagilov,+Rustem+F.%22) [![ORCID icon](https://authors.library.caltech.edu/static/images/orcid.svg)](https://orcid.org/0000-0002-3680-4399 "Ismagilov, Rustem F.'s ORCID profile") Show affiliations - 1\. [![ROR icon](https://authors.library.caltech.edu/static/images/ror-icon.svg)](https://ror.org/05dxps055 "California Institute of Technology's ROR profile") California Institute of Technology ## Abstract During a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results. ## Additional Information © The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. We thank the study participants for making this work possible. We thank Study Coordinators Saharai Caldera for suggesting the laboratory evaluation and both Saharai and Hannah Davich for removing lot 152000 from circulation in the study. We thank Taikun Yamada, John Raymond B. Reyna, Paolo Piatti and Yap Ching Chew for performing and verifying the validity of RT-qPCR results as previously reported. Finally, we thank all the case investigators and contact tracers at the Pasadena Public Health Department and Caltech Student Wellness Services for their efforts in study recruitment and their work in the pandemic response. This work was supported by the Ronald and Maxine Linde Center for New Initiatives at the California Institute of Technology and the Jacobs Institute for Molecular Engineering for Medicine at the California Institute of Technology. A UCLA DGSOM Geffen Fellowship to AVW. Data Availability: The data underlying the results presented in the study are available at CaltechDATA at: https://doi.org/10.22002/fmz6a-0x036. Alyssa M. Carter and Alexander Viloria Winnett contributed equally to this manuscript. ## Attached Files Published - [ofac701.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701.pdf?download=1) Supplemental Material - [ofac701\_supplementary\_data.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701_supplementary_data.pdf?download=1) ## Files ### ofac701.pdf ### Files (507.3 kB) \| Name \| Size \| \| \|---\|---\|---\| \| [ofac701.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701.pdf?download=1) md5:2c1716cccecfe2021915a6e0f123c979 \| 337\.9 kB \| [Preview](https://authors.library.caltech.edu/records/0mjqz-64458/preview/ofac701.pdf?include_deleted=0) [Download](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701.pdf?download=1) \| \| [ofac701\_supplementary\_data.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701_supplementary_data.pdf?download=1) md5:f3101239a9d910c5dccc5ed24b5c9ac1 \| 169\.5 kB \| [Preview](https://authors.library.caltech.edu/records/0mjqz-64458/preview/ofac701_supplementary_data.pdf?include_deleted=0) [Download](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701_supplementary_data.pdf?download=1) \| ## Additional details ### Identifiers PMCID [PMC9887260](https://www.ncbi.nlm.nih.gov/pmc/PMC9887260 "Opens in new tab") Eprint ID 118971 Resolver ID CaltechAUTHORS:20230130-263514000.2 ### Related works Describes [10\.22002/fmz6a-0x036](https://doi.org/10.22002/fmz6a-0x036 "Opens in new tab") (DOI) ### Funding Ronald and Maxine Linde Center for New Initiatives Jacobs Institute for Molecular Engineering for Medicine UCLA ### Dates Created 2023-01-30 Created from EPrint's datestamp field Updated 2023-07-05 Created from EPrint's last\_modified field ### Caltech Custom Metadata Caltech groups COVID-19, Jacobs Institute for Molecular Engineering for Medicine, Division of Biology and Biological Engineering (BBE) 62 Views 44 Downloads Show more details \| \| All versions \| This version \| \|---\|---\|---\| \| Views Total views \| 62 \| 62 \| \| Downloads Total downloads \| 44 \| 44 \| \| Data volume Total data volume \| 13\.4 MB \| 13\.4 MB \| [More info on how stats are collected....](https://authors.library.caltech.edu/help/statistics) ## Versions ## Keywords and subjects ### Keywords - [Infectious Diseases](https://authors.library.caltech.edu/search?q=metadata.subjects.subject:%22Infectious+Diseases%22 "Search results for Infectious Diseases") - [Oncology](https://authors.library.caltech.edu/search?q=metadata.subjects.subject:%22Oncology%22 "Search results for Oncology") ## Details DOI ![10\.1093/ofid/ofac701](https://authors.library.caltech.edu/badge/DOI/10.1093/ofid/ofac701.svg) DOI Badge #### DOI #### ### Markdown ``` [![DOI](https://authors.library.caltech.edu/badge/DOI/10.1093/ofid/ofac701.svg)](https://doi.org/10.1093/ofid/ofac701) ``` ### reStructuredText ``` .. image:: https://authors.library.caltech.edu/badge/DOI/10.1093/ofid/ofac701.svg :target: https://doi.org/10.1093/ofid/ofac701 ``` ### HTML ``` <a href="https://doi.org/10.1093/ofid/ofac701"><img src="https://authors.library.caltech.edu/badge/DOI/10.1093/ofid/ofac701.svg" alt="DOI"></a> ``` ### Image URL ``` https://authors.library.caltech.edu/badge/DOI/10.1093/ofid/ofac701.svg ``` ### Target URL ``` https://doi.org/10.1093/ofid/ofac701 ``` Resource type Journal Article Publisher Oxford University Press Published in Open Forum Infectious Diseases, 10(1), Art. No. ofac701, ISSN: 2328-8957, 2023. ## Rights #### License - Other No commercial reproduction, distribution, display or performance rights in this work are provided. ## Communities ## Export ## Technical metadata Created August 22, 2023 Modified November 22, 2025 Jump up [About](https://library.caltech.edu/c.php?g=512684&p=11281171) [Policies](https://library.caltech.edu/c.php?g=512684&p=11281170) [Help](https://library.caltech.edu/c.php?g=512684&p=11207017) [Powered by InvenioRDM](https://inveniosoftware.org/products/rdm)
Readable Markdown	Published January 30, 2023 \\| Version Published + Supplemental Material Journal Article Open - 1\. [![ROR icon](https://authors.library.caltech.edu/static/images/ror-icon.svg)](https://ror.org/05dxps055 "California Institute of Technology's ROR profile") California Institute of Technology ## Abstract During a household-transmission field study using COVID-19 antigen rapid diagnostic tests (Ag-RDT), a common test strip lot was identified among three participants with false-positive results. In blinded laboratory evaluation, this lot, exhibited a significantly higher false-positive rate than other lots. Because a positive Ag-RDT result often prompts action, reducing lot-specific false positives can maintain confidence and actionability of true-positive Ag-RDT results. ## Additional Information © The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. We thank the study participants for making this work possible. We thank Study Coordinators Saharai Caldera for suggesting the laboratory evaluation and both Saharai and Hannah Davich for removing lot 152000 from circulation in the study. We thank Taikun Yamada, John Raymond B. Reyna, Paolo Piatti and Yap Ching Chew for performing and verifying the validity of RT-qPCR results as previously reported. Finally, we thank all the case investigators and contact tracers at the Pasadena Public Health Department and Caltech Student Wellness Services for their efforts in study recruitment and their work in the pandemic response. This work was supported by the Ronald and Maxine Linde Center for New Initiatives at the California Institute of Technology and the Jacobs Institute for Molecular Engineering for Medicine at the California Institute of Technology. A UCLA DGSOM Geffen Fellowship to AVW. Data Availability: The data underlying the results presented in the study are available at CaltechDATA at: https://doi.org/10.22002/fmz6a-0x036. Alyssa M. Carter and Alexander Viloria Winnett contributed equally to this manuscript. ## Attached Files Published - [ofac701.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701.pdf?download=1) Supplemental Material - [ofac701\_supplementary\_data.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701_supplementary_data.pdf?download=1) ## Files ### ofac701.pdf ### Files (507.3 kB) \| Name \| Size \| \| \|---\|---\|---\| \| [ofac701.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701.pdf?download=1) md5:2c1716cccecfe2021915a6e0f123c979 \| 337\.9 kB \| [Preview](https://authors.library.caltech.edu/records/0mjqz-64458/preview/ofac701.pdf?include_deleted=0) [Download](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701.pdf?download=1) \| \| [ofac701\_supplementary\_data.pdf](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701_supplementary_data.pdf?download=1) md5:f3101239a9d910c5dccc5ed24b5c9ac1 \| 169\.5 kB \| [Preview](https://authors.library.caltech.edu/records/0mjqz-64458/preview/ofac701_supplementary_data.pdf?include_deleted=0) [Download](https://authors.library.caltech.edu/records/0mjqz-64458/files/ofac701_supplementary_data.pdf?download=1) \| ## Additional details [PMC9887260](https://www.ncbi.nlm.nih.gov/pmc/PMC9887260 "Opens in new tab") 118971 CaltechAUTHORS:20230130-263514000.2 2023-01-30 Created from EPrint's datestamp field 2023-07-05 Created from EPrint's last\_modified field COVID-19, Jacobs Institute for Molecular Engineering for Medicine, Division of Biology and Biological Engineering (BBE)
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