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During March 2022 to January 2023, two Omicron waves hit Shanghai and caused a massive number of reinfections. To better understand the incidence and clinical characteristics of SARS‐CoV‐2 reinfection in Shanghai, China, we conducted a multicenter cohort study. COVID‐19 patients first infected with BA.2 (March 1, 2022–May 23, 2022) who were quarantined in Huashan Hospital, Renji Hospital, and Shanghai...
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