Asymptomatic SARS-CoV-2 Vaccine Breakthrough Infections in Health Care Workers Identified Through Routine Universal Surveillance Testing | Annals of Internal Medicine
Background: Concerns exist about the efficacy of COVID-19 vaccines against immune escape by viral variants of concern (VOCs): Delta is currently the most common VOC worldwide (1), and nasopharyngeal swabs (NPSs) show that fully vaccinated persons, like unvaccinated persons, harbor infectious viral loads (2). Reports to date have assessed the prevalence of vaccine breakthrough (VBT) infection…
