Bozio CH, Grannis SJ, Naleway AL, Ong TC, et al. Laboratory-Confirmed COVID-19 Among Adults Hospitalized with COVID-19-Like
Illness with Infection-Induced or mRNA Vaccine-Induced SARS-CoV-2 Immunity - Nine
States, January-September 2021. MMWR Morb Mortal Wkly Rep 2021;70:1539-1544.
PMID: 34735425