Um estudo de base populacional no Catar mostrou que infecção prévia fornece proteção robusta contra reinfecção pelas variantes Alfa, Beta e Delta do SARS-CoV-2 (cerca de 90%). No entanto, a proteção contra reinfecção pela variante Ômicron foi menor (em torno de 60%).

Protection against the Omicron Variant from Previous SARS-CoV-2 Infection – New England Journal of Medicine

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Using a national database in Qatar, investigators found that previous #SARSCoV2 infection provided protection against reinfection that ranged from 85% to 92% for alpha, beta, and delta strains and was approx 60% protective against omicron. #COVID19 https://t.co/SGODYCmkP3 pic.twitter.com/OkgjCbyZBj

— NEJM (@NEJM) February 9, 2022