Quantifying the risk of SARS-CoV-2 reinfection over time

“Summary: … To our knowledge, this is the first systematic review to synthesise the evidence on the risk of SARS-CoV-2 reinfection over time… Across studies, the total number of PCR-positive or antibody-positive participants at baseline was 615,777, and the maximum duration of follow-up was more than 10 months in three studies. Reinfection was an uncommon event (absolute rate 0%–1.1%), with no study reporting an increase in the risk of reinfection over time… These data suggest that naturally acquired SARS-CoV-2 immunity does not wane for at least 10 months post-infection."