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Clinical performance of the Centaur XP anti‐SARS‐CoV‐2 immunoassay: kinetics of the antibody response in COVID patients relative to time since positive RT‐PCR/or COVID‐antigen (A) and to time since symptom onset (B) as compared with prepandemic controls. RT‐PCR, reverse transcription polymerase chain reaction; SARS‐CoV‐2, severe acute respiratory syndrome coronavirus 2
