Delta Variant Key to Breakthrough Infections in Vaccinated Israelis

Pfizer announced Thursday that it will seek US Food and Drug Administration (FDA) authorization for a booster shot of its COVID-19 vaccine as the company acknowledges its two-dose vaccine has shown waning effectiveness against the Delta variant. In a statement, the company said it will seek an emergency use authorization […]

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Asymptomatic and Symptomatic SARS-CoV-2 Infections After BNT162b2 Vaccination in a Routinely Screened Workforce

A 2-dose regimen of the BNT162b2 vaccine (Pfizer-BioNTech) against SARS-CoV-2 was authorized in December 2020 based on reported 94.8% efficacy.1 Although an association between vaccination and a reduction in symptomatic disease has been well described, an association with asymptomatic infection remains unclear.2,3 Methods In March 2020, St Jude Children’s Research Hospital […]

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