Medical Health Cluster


Effect of Covid-19 Vaccination on Transmission of Alpha and Delta Variants

In this study, 37% of 146,000 PCR-tested contacts of infected persons in England were positive for SARS-CoV-2. Transmission of the alpha variant from twice-vaccinated index patients was rarer than that from unvaccinated index patients (adjusted rate ratio with BNT162b2, 0.32). Vaccine protection waned over time and was more effective against […]

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Transmission Risk in SARS-CoV-2–Infected, Fully Vaccinated Individuals: Real-World Data

Those who develop COVID-19 despite being fully vaccinated are considerably less infectious for contact persons, who in turn are protected from infection if vaccinated. It has become evident that some individuals may develop COVID-19 despite full vaccination, especially if they are older or immunocompromised and if longer intervals have elapsed […]

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