Author

Mohammad R. Hasan

2 papers indexed here

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Open access Aug 2026

Evaluating COVID-19 vaccine effectiveness across epidemiologic designs: test-negative case-control versus retrospective cohort analyses in a nationwide study

Abstract Background Observational studies are central to assessing vaccine effectiveness and informing public health policy. The two most common designs are test-negative case-control and cohort studies, yet direct comparisons of their performance using the same population, data sources, and analytic strategies remain...

Layan Sukik, Pradipta Paul, H. Ayoub et al. · International Journal of Epi... · 0 citations

Open access Jul 2026

Healthy vaccinee effect did not bias COVID-19 vaccine effectiveness estimates

Health status influences COVID-19 vaccine uptake, with vaccinated individuals generally being healthier than unvaccinated ones. This difference may impact vaccine effectiveness estimates. This study investigated the magnitude of this healthy vaccinee effect on effectiveness estimates. Three national, matched, retrospec...

H. Chemaitelly, H. Ayoub, Peter V. Coyle et al. · Communications Health · 0 citations