We report a superspreading event of severe acute respiratory syndrome coronavirus 2 infection initiated at a bar in Vietnam with evidence of symptomatic and asymptomatic transmission, based on ministry of health reports, patient interviews, and whole-genome sequence analysis. Crowds in enclosed indoor settings with poor ventilation may be considered at high risk for transmission.
Keywords: COVID-19; SARS-CoV-2; Vietnam; coronavirus disease; disease cluster; pandemic; respiratory infections; reverse transcription PCR; severe acute respiratory syndrome coronavirus 2; superspreading; viruses; whole-genome sequencing.