“Methods: We investigated the incidence of SARS-CoV-2 primary infection and reinfection among individuals who, during the first wave of the pandemic in Italy (February to July 2020), underwent diagnostic reverse-transcriptase–polymerase chain reaction (PCR)…
Results: … During the follow-up (mean [SD], 280 days) 5 reinfections … were confirmed in the cohort of 1579 positive patients…
Discussion: The study results suggest that reinfections are rare events and patients who have recovered from COVID-19 have a lower risk of reinfection. Natural immunity to SARS-CoV-2 appears to confer a protective effect for at least a year.”
This is an open access article distributed under the terms of the CC-BY License. © 2021 Vitale J et al. JAMA Internal Medicine.