Avian Flu Diary: EID Journal: Early SARS-CoV-2 Reinfections within 60 Days and Implications for Retesting Policies

During the first two years of COVID, reinfection – while it was well documented – was fairly rare. But after antigenically highly divergent Omicron variant(s) emerged in late 2021, reinfections – and vaccine breakthrough infections – have soared.
As a result, some of the assumptions about reinfections and the duration of immunity following infection (and vaccination) that worked reasonably well with the first 3 COVID variants (D614G, Alpha & Delta) may no longer apply.

Source: Avian Flu Diary: EID Journal: Early SARS-CoV-2 Reinfections within 60 Days and Implications for Retesting Policies