SARS‐CoV‐2 infection shortly after BNT162b2 vaccination results in high anti‐spike antibody levels in nursing home residents and staff

INTRODUCTION: One dose of a coronavirus disease 2019 (COVID-19) vaccine can elicit high antibody titers in individuals who were previously infected by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, it is unclear how a SARS-CoV-2 infection shortly after a first COVID-19 vaccine dose affects antibody responses. METHODS: Here we investigate residents and staff of a nursing home, where a COVID-19 outbreak occurred shortly after the first BNT162b2 immunization. RESULTS AND CONCLUSIONS: Our data show that individuals who got infected as early as 10 days after their first immunization show antibody levels comparable to fully vaccinated individuals.