We investigated the kinetics of severe acute respiratory syndrome coronavirus 2 neutralizing antibodies in 7 asymptomatic persons and 11 patients with pneumonia. The geometric mean titer of neutralizing antibodies declined from 219.4 at 2 months to 143.7 at 5 months after infection, indicating a waning antibody response.
Keywords: 2019 novel coronavirus disease; COVID-19; ELISA; SARS-CoV-2; antibodies; coronavirus; coronavirus disease; neutralizing antibodies; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses; waning immunity; zoonoses.