🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 129 (from laksa052)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa129.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, ml_categories_json AS ml_categories_json, ml_types_json AS ml_types_json, ml_intent_types_json AS ml_intent_types_json, meta_language AS meta_language, attrs_author AS attrs_author, ifNull(toUnixTimestamp(attrs_publish_time), 0) AS attrs_publish_time, ifNull(toUnixTimestamp(attrs_original_publish_time), 0) AS attrs_original_publish_time, ifNull(attrs_is_republished, 0) AS attrs_is_republished, ifNull(attrs_nr_words, 0) AS attrs_nr_words, ifNull(attrs_boilerpipe_nr_words, 0) AS attrs_boilerpipe_nr_words, ifNull(body_ext_links_number, 0) AS body_ext_links_number, ifNull(body_int_links_number, 0) AS body_int_links_number, ifNull(meta_nofollow, 0) AS meta_nofollow, ifNull(meta_noarchive, 0) AS meta_noarchive, ifNull(props_was_rendered, 0) AS props_was_rendered, ifNull(src_redirect, \'\') AS src_redirect, ifNull(download_time_msec, 0) AS download_time_msec, ifNull(download_ttfb_msec, 0) AS download_ttfb_msec, ifNull(download_size, 0) AS download_size FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://pubmed.ncbi.nlm.nih.gov/37492805/\')), getAhrefsUnparsedNoserviceFromURL(\'https://pubmed.ncbi.nlm.nih.gov/37492805/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/","crawl_time":1755568382,"first_indexed_time":0,"http_code":200,"src_unparsed":"gov,nih!nlm,ncbi,pubmed,\/37492805\/ s443","src_root_hash":"7295144728021232729","history_drop_reason":"tooold","meta_title":"Common Side Effects of Pfizer COVID-19 Vaccine: An Experience From Pakistan","meta_descriptions":["Introduction The severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) epidemic spread quickly. Vaccines are now being distributed to stop the infectious spread and halt fatalities. The Pfizer-BioNTech vaccine was the first mRNA-based vaccine introduced to boost immunity against COVID-19; how …"],"attrs_boilerpipe_text":"\n      \n      Introduction The severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) epidemic spread quickly. Vaccines are now being distributed to stop the infectious spread and halt fatalities. The Pfizer-BioNTech vaccine was the first mRNA-based vaccine introduced to boost immunity against COVID-19; however, it could lead to various adverse reactions. Therefore, the aim of this study was to assess the prevalence of Pfizer vaccine side effects among participants. Methods This was a multicenter cross-sectional study that was performed using a non-probability sampling method. The study period was about six months from March 1, 2022, to August 31, 2022. A total of 1000 participants who received two doses of the Pfizer vaccine met the inclusion criteria. Demographic details of participants, for example, gender, age, comorbidities, Pfizer vaccine with both doses along with booster dose, previous exposure to coronavirus disease 2019 (COVID-19) infection, and the incidence of any local and systemic side effects following the first and second doses of vaccine, were reported. Results The study findings showed that out of 1000 participants, 644 (64.4%) were males and 356 (35.6%) were females; their mean age was 43.06±14.98 years. Among them, 280 (28.0%) had hypertension and 356 (35.6%) had diabetes. Following the first dose of the Pfizer vaccine, burning at the injection site and fever were the most commonly reported side effects in 704 (70.4%) and 700 (70.0%) participants, respectively. Following the second dose of the Pfizer vaccine, muscle pain was the most commonly reported side effect in 628 (62.8%) participants. Conclusion This study concluded that the most frequent adverse effects of the Pfizer vaccine were burning at the injection site, fever, pain at the injection site, muscle pain, swelling at the injection site, and joint pain. Moreover, the first dose was associated with more side effects than the second dose.\n    ","attrs_markdown":"# Common Side Effects of Pfizer COVID-19 Vaccine: An Experience From Pakistan\nCureus. 2023 Jun 23;15(6):e40878.   doi: 10.7759\/cureus.40878.   eCollection 2023 Jun.\n\n### Authors\n[Syed Muhammad Safi Haider](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Haider+SMS&cauthor_id=37492805)  [1](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-1 \"Internal Medicine, Hamdard College of Medicine and Dentistry, Karachi, PAK.\") , [Shaf Ali Alvi](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Alvi+SA&cauthor_id=37492805)  [1](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-1 \"Internal Medicine, Hamdard College of Medicine and Dentistry, Karachi, PAK.\") , [Hamza Khan](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Khan+H&cauthor_id=37492805)  [2](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-2 \"General Surgery, Hamdard College of Medicine and Dentistry, Karachi, PAK.\") , [Rameen Majeed](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Majeed+R&cauthor_id=37492805)  [3](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-3 \"Biochemistry, Jinnah Sindh Medical University, Karachi, PAK.\") , [Tatheer Syed](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Syed+T&cauthor_id=37492805)  [4](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-4 \"Public Health, Jinnah Sindh Medical University, Karachi, PAK.\") , [Adnan Anwar](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Anwar+A&cauthor_id=37492805)  [5](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-5 \"Physiology, Hamdard College of Medicine and Dentistry, Karachi, PAK.\")   [6](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-6 \"Internal Medicine, Essa General Hospital, Karachi, PAK.\") , [Atif A Hashmi](https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=Hashmi+AA&cauthor_id=37492805)  [7](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/#affiliation-7 \"Pathology, Liaquat National Hospital and Medical College, Karachi, PAK.\")\n\n### Affiliations\n- 1 Internal Medicine, Hamdard College of Medicine and Dentistry, Karachi, PAK.\n- 2 General Surgery, Hamdard College of Medicine and Dentistry, Karachi, PAK.\n- 3 Biochemistry, Jinnah Sindh Medical University, Karachi, PAK.\n- 4 Public Health, Jinnah Sindh Medical University, Karachi, PAK.\n- 5 Physiology, Hamdard College of Medicine and Dentistry, Karachi, PAK.\n- 6 Internal Medicine, Essa General Hospital, Karachi, PAK.\n- 7 Pathology, Liaquat National Hospital and Medical College, Karachi, PAK.\n\n- PMID:   [37492805](https:\/\/pubmed.ncbi.nlm.nih.gov\/37492805\/)\n- PMCID:   [PMC10363686](https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10363686\/)\n- DOI:   [10\\.7759\/cureus.40878](https:\/\/doi.org\/10.7759\/cureus.40878)\n\n## Abstract\nIntroduction The severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) epidemic spread quickly. Vaccines are now being distributed to stop the infectious spread and halt fatalities. The Pfizer-BioNTech vaccine was the first mRNA-based vaccine introduced to boost immunity against COVID-19; however, it could lead to various adverse reactions. Therefore, the aim of this study was to assess the prevalence of Pfizer vaccine side effects among participants. Methods This was a multicenter cross-sectional study that was performed using a non-probability sampling method. The study period was about six months from March 1, 2022, to August 31, 2022. A total of 1000 participants who received two doses of the Pfizer vaccine met the inclusion criteria. Demographic details of participants, for example, gender, age, comorbidities, Pfizer vaccine with both doses along with booster dose, previous exposure to coronavirus disease 2019 (COVID-19) infection, and the incidence of any local and systemic side effects following the first and second doses of vaccine, were reported. Results The study findings showed that out of 1000 participants, 644 (64.4%) were males and 356 (35.6%) were females; their mean age was 43.06±14.98 years. Among them, 280 (28.0%) had hypertension and 356 (35.6%) had diabetes. Following the first dose of the Pfizer vaccine, burning at the injection site and fever were the most commonly reported side effects in 704 (70.4%) and 700 (70.0%) participants, respectively. Following the second dose of the Pfizer vaccine, muscle pain was the most commonly reported side effect in 628 (62.8%) participants. Conclusion This study concluded that the most frequent adverse effects of the Pfizer vaccine were burning at the injection site, fever, pain at the injection site, muscle pain, swelling at the injection site, and joint pain. Moreover, the first dose was associated with more side effects than the second dose.\n\n**Keywords:**  burning; covid-19; fever; joint pain; pain; pfizer vaccine; side effects; swelling; vaccine.\n\nCopyright © 2023, Haider et al.","attrs_readable_markdown":null,"meta_canonical":null,"ml_categories_json":"{\"\/Health\":972,\"\/Health\/Public_Health\":791,\"\/Health\/Public_Health\/Health_Policy\":773,\"\/Science\":294,\"\/Science\/Biological_Sciences\":292,\"\/Science\/Biological_Sciences\/Other\":212}","ml_types_json":"{\"\/Article\":931,\"\/Article\/Study_or_Research_Findings\":922}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1755568382,"attrs_is_republished":0,"attrs_nr_words":"463","attrs_boilerpipe_nr_words":"296","body_ext_links_number":1,"body_int_links_number":9,"meta_nofollow":1,"meta_noarchive":1,"props_was_rendered":0,"src_redirect":"","download_time_msec":179,"download_ttfb_msec":177,"download_size":8168}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

🚫

NOT INDEXABLE

✅

CRAWLED

8 months ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	FAIL	`download_stamp > now() - 6 MONTH`	8.2 months ago
History drop	FAIL	`isNull(history_drop_reason)`	tooold
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://pubmed.ncbi.nlm.nih.gov/37492805/

Last Crawled

2025-08-19 01:53:02 (8 months ago)

First Indexed

not set

HTTP Status Code

200

Content

Meta Title

Common Side Effects of Pfizer COVID-19 Vaccine: An Experience From Pakistan

Meta Description

Meta Canonical

null

Boilerpipe Text

Introduction The severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) epidemic spread quickly. Vaccines are now being distributed to stop the infectious spread and halt fatalities. The Pfizer-BioNTech vaccine was the first mRNA-based vaccine introduced to boost immunity against COVID-19; however, it could lead to various adverse reactions. Therefore, the aim of this study was to assess the prevalence of Pfizer vaccine side effects among participants. Methods This was a multicenter cross-sectional study that was performed using a non-probability sampling method. The study period was about six months from March 1, 2022, to August 31, 2022. A total of 1000 participants who received two doses of the Pfizer vaccine met the inclusion criteria. Demographic details of participants, for example, gender, age, comorbidities, Pfizer vaccine with both doses along with booster dose, previous exposure to coronavirus disease 2019 (COVID-19) infection, and the incidence of any local and systemic side effects following the first and second doses of vaccine, were reported. Results The study findings showed that out of 1000 participants, 644 (64.4%) were males and 356 (35.6%) were females; their mean age was 43.06±14.98 years. Among them, 280 (28.0%) had hypertension and 356 (35.6%) had diabetes. Following the first dose of the Pfizer vaccine, burning at the injection site and fever were the most commonly reported side effects in 704 (70.4%) and 700 (70.0%) participants, respectively. Following the second dose of the Pfizer vaccine, muscle pain was the most commonly reported side effect in 628 (62.8%) participants. Conclusion This study concluded that the most frequent adverse effects of the Pfizer vaccine were burning at the injection site, fever, pain at the injection site, muscle pain, swelling at the injection site, and joint pain. Moreover, the first dose was associated with more side effects than the second dose.

Markdown

# Common Side Effects of Pfizer COVID-19 Vaccine: An Experience From Pakistan Cureus. 2023 Jun 23;15(6):e40878. doi: 10.7759/cureus.40878. eCollection 2023 Jun. ### Authors [Syed Muhammad Safi Haider](https://pubmed.ncbi.nlm.nih.gov/?term=Haider+SMS&cauthor_id=37492805) [1](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-1 "Internal Medicine, Hamdard College of Medicine and Dentistry, Karachi, PAK.") , [Shaf Ali Alvi](https://pubmed.ncbi.nlm.nih.gov/?term=Alvi+SA&cauthor_id=37492805) [1](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-1 "Internal Medicine, Hamdard College of Medicine and Dentistry, Karachi, PAK.") , [Hamza Khan](https://pubmed.ncbi.nlm.nih.gov/?term=Khan+H&cauthor_id=37492805) [2](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-2 "General Surgery, Hamdard College of Medicine and Dentistry, Karachi, PAK.") , [Rameen Majeed](https://pubmed.ncbi.nlm.nih.gov/?term=Majeed+R&cauthor_id=37492805) [3](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-3 "Biochemistry, Jinnah Sindh Medical University, Karachi, PAK.") , [Tatheer Syed](https://pubmed.ncbi.nlm.nih.gov/?term=Syed+T&cauthor_id=37492805) [4](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-4 "Public Health, Jinnah Sindh Medical University, Karachi, PAK.") , [Adnan Anwar](https://pubmed.ncbi.nlm.nih.gov/?term=Anwar+A&cauthor_id=37492805) [5](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-5 "Physiology, Hamdard College of Medicine and Dentistry, Karachi, PAK.") [6](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-6 "Internal Medicine, Essa General Hospital, Karachi, PAK.") , [Atif A Hashmi](https://pubmed.ncbi.nlm.nih.gov/?term=Hashmi+AA&cauthor_id=37492805) [7](https://pubmed.ncbi.nlm.nih.gov/37492805/#affiliation-7 "Pathology, Liaquat National Hospital and Medical College, Karachi, PAK.") ### Affiliations - 1 Internal Medicine, Hamdard College of Medicine and Dentistry, Karachi, PAK. - 2 General Surgery, Hamdard College of Medicine and Dentistry, Karachi, PAK. - 3 Biochemistry, Jinnah Sindh Medical University, Karachi, PAK. - 4 Public Health, Jinnah Sindh Medical University, Karachi, PAK. - 5 Physiology, Hamdard College of Medicine and Dentistry, Karachi, PAK. - 6 Internal Medicine, Essa General Hospital, Karachi, PAK. - 7 Pathology, Liaquat National Hospital and Medical College, Karachi, PAK. - PMID: [37492805](https://pubmed.ncbi.nlm.nih.gov/37492805/) - PMCID: [PMC10363686](https://pmc.ncbi.nlm.nih.gov/articles/PMC10363686/) - DOI: [10\.7759/cureus.40878](https://doi.org/10.7759/cureus.40878) ## Abstract Introduction The severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) epidemic spread quickly. Vaccines are now being distributed to stop the infectious spread and halt fatalities. The Pfizer-BioNTech vaccine was the first mRNA-based vaccine introduced to boost immunity against COVID-19; however, it could lead to various adverse reactions. Therefore, the aim of this study was to assess the prevalence of Pfizer vaccine side effects among participants. Methods This was a multicenter cross-sectional study that was performed using a non-probability sampling method. The study period was about six months from March 1, 2022, to August 31, 2022. A total of 1000 participants who received two doses of the Pfizer vaccine met the inclusion criteria. Demographic details of participants, for example, gender, age, comorbidities, Pfizer vaccine with both doses along with booster dose, previous exposure to coronavirus disease 2019 (COVID-19) infection, and the incidence of any local and systemic side effects following the first and second doses of vaccine, were reported. Results The study findings showed that out of 1000 participants, 644 (64.4%) were males and 356 (35.6%) were females; their mean age was 43.06±14.98 years. Among them, 280 (28.0%) had hypertension and 356 (35.6%) had diabetes. Following the first dose of the Pfizer vaccine, burning at the injection site and fever were the most commonly reported side effects in 704 (70.4%) and 700 (70.0%) participants, respectively. Following the second dose of the Pfizer vaccine, muscle pain was the most commonly reported side effect in 628 (62.8%) participants. Conclusion This study concluded that the most frequent adverse effects of the Pfizer vaccine were burning at the injection site, fever, pain at the injection site, muscle pain, swelling at the injection site, and joint pain. Moreover, the first dose was associated with more side effects than the second dose. **Keywords:** burning; covid-19; fever; joint pain; pain; pfizer vaccine; side effects; swelling; vaccine. Copyright © 2023, Haider et al.

Readable Markdown

null

ML Classification

ML Categories

/Health		97.2%
/Health/Public_Health		79.1%
/Health/Public_Health/Health_Policy		77.3%
/Science		29.4%
/Science/Biological_Sciences		29.2%
/Science/Biological_Sciences/Other		21.2%

Raw JSON

{
    "/Health": 972,
    "/Health/Public_Health": 791,
    "/Health/Public_Health/Health_Policy": 773,
    "/Science": 294,
    "/Science/Biological_Sciences": 292,
    "/Science/Biological_Sciences/Other": 212
}

ML Page Types

/Article		93.1%
/Article/Study_or_Research_Findings		92.2%

Raw JSON

{
    "/Article": 931,
    "/Article/Study_or_Research_Findings": 922
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2025-08-19 01:53:02 (8 months ago)

Republished

Word Count (Total)

463

Word Count (Content)

296

Links

External Links

Internal Links

Technical SEO

Meta Nofollow

Yes

Meta Noarchive

Yes

JS Rendered

Redirect Target

null

Performance

Download Time (ms)

179

TTFB (ms)

177

Download Size (bytes)

8,168

Shard

129 (laksa)

Root Hash

7295144728021232729

Unparsed URL

gov,nih!nlm,ncbi,pubmed,/37492805/ s443