ArticleBMJ open2024
Evaluation of BBIBP-CorV Sinopharm COVID-19 vaccine effectiveness in Sri Lanka: a test-negative case control study.
Article in BMJ open, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 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
3 citing papers in PubMed.
- Patterns of COVID-19 mortality during the second and third waves in Sri Lanka: a cross-sectional study from a tertiary care center.BMC infectious diseases · 2026Article
- Real-world Evaluation of the Effectiveness of Sinopharm COVID-19 Vaccine Against Symptomatic COVID-19 in an Omicron-Dominant Setting in Mozambique: A Test-Negative, Case-Control Study.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2025Article
- The effect of COVID-19 vaccination on viral load among health care workers: a retrospective cohort study.Clinical and experimental vaccine research · 2025Article
Corrections and comments
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Authors and funding
11 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivesThere is limited research on real-world effectiveness of BBIBP-CorV Sinopharm COVID-19 vaccine. This study evaluated real-world effectiveness of Sinopharm vaccine in Sri Lanka by assessing absolute vaccine efficacy. DESIGN AND
settingA retrospective test-negative case-control study was conducted at ten large government hospitals across the country.
participantsConsecutive adults aged ≥18 years attending outpatient departments who tested reverse-transcription-PCR positive for SARS-CoV-2 during the study period were recruited.
main outcome measuresAn interviewer-administered questionnaire was administered, and outcome of COVID-19 infection was assessed in cases.
resultsOf 1829 recruited, 914 (49.9%) were male, and mean age was 45.2 (SD 15.3) years; 1634 (89.3%) were vaccinated with two doses of BBIBP-CorV Sinopharm vaccine, while 195 (10.1%) were vaccine-naïve. Compared with the vaccinated, unvaccinated persons were older but otherwise similar in their demographic and medical profiles. Unvaccinated were more likely to have fever, shortness of breath and vomiting as symptoms and were more likely to seek treatment. Significantly more vaccinated individuals received treatment at home. After admission, the unvaccinated were more likely to receive oxygen. Significantly more unvaccinated persons died of COVID-19 compared with the vaccinated. Sinopharm vaccine was 78.2% (94% CI 69.0% to 85.0%) effective at preventing COVID-19 infection, 88.7% (81.6%-93.2%) effective at preventing severe infection and 85.6% (69.6%-93.6%) effective at preventing death.
conclusionsBBIBP-CorV Sinopharm vaccine is effective at mitigating severity of illness and reducing the likelihood of hospitalisation, severe illness and death, in those who received primary vaccination, compared with the unvaccinated.
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