In March 2020, mild signs and symptoms of coronavirus disease developed in a healthy 33-year-old man in Hong Kong. His first infection did not produce virus neutralizing antibodies. In August, he had asymptomatic reinfection, suggesting that persons without a robust neutralizing antibody response might be at risk for reinfection.
Keywords: 2019 novel coronavirus disease; COVID-19; Hong Kong; SARS-CoV-2; antibodies; coronavirus disease; coronaviruses; immune response; reinfection; respiratory infections; serology; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.