ArticleVaccine: X2021
Appendicitis as a possible safety signal for the COVID-19 vaccines.
Article in Vaccine: X, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
11 citing papers in PubMed.
- Background incidence rates and observed-to-expected ratios of adverse events of special interest after covid-19 mRNA vaccination during pregnancy in France: a nationwide population-based study.The Lancet regional health. Europe · 2026Article
- Acute Appendicitis After COVID-19 Vaccines in Italy: A Self-Controlled Case Series Study.Drug safety · 2024Article
- Safety outcomes following COVID-19 vaccination and infection in 5.1 million children in England.Nature communications · 2024Article
- Acute abdomen following COVID-19 vaccination: a systematic review.Clinical and experimental vaccine research · 2024Article
- Nationwide safety surveillance of COVID-19 mRNA vaccines following primary series and first booster vaccination in Singapore.Vaccine: X · 2023Article
- To aspirate or not to aspirate? Considerations for the COVID-19 vaccines.Pharmacological reports : PR · 2022Review
- Article
- Current Evidence in SARS-CoV-2 mRNA Vaccines and Post-Vaccination Adverse Reports: Knowns and Unknowns.Diagnostics (Basel, Switzerland) · 2022Review
- Acute appendicitis following the COVID-19 vaccine.Journal of surgical case reports · 2022Article
- Histopathologic Changes of Appendicitis Stage During the COVID-19 Pandemic.Medical journal of the Islamic Republic of Iran · 2022Article
- Clinical characteristics of SARS-CoV-2 vaccine-related acute appendicitis.Canadian journal of surgery. Journal canadien de chirurgieArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
2 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
This study reviewed cases of appendicitis following administration of COVID-19 vaccines reported to VigiBase, the WHO database of individual case safety reports (ICSRs). Three hundred fifty-eight cases were identified, and disproportionate reporting was noted, with 329 calculated expected cases. Upon review, 24 ICSRs were excluded, so 334 unique ICSRs underwent clinical review from 19 countries. Forty-eight percent of ICSRs reported imaging and 69% noted surgical intervention. The cases were clinically coherent, with an apparent increase in reporting in the four days post-vaccination and a possible dose-response relationship. Appendicitis has been suggested as an adverse event of special interest post-vaccination against COVID-19 after a numerical increase in the vaccine arm of a clinical trial. The case series may be affected by differences in global patterns of reporting, and it is not possible to prove nor disprove causality from this case series. Global longitudinal studies are required to clarify any possible relationship.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.