Shen Y, Li C, Dong H, et al. - By analyzing a community coronavirus disease 2019 (COVID-19) outbreak in Zhejiang province, researchers sought to determine potential transmission routes of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection with epidemiologic evidence from a COVID-19 outbreak, in this cohort study. A total of 128 people took 2 buses (60 [46.9%] from bus 1 and 68 [53.1%] from bus 2) on a 100-minute round trip to visit a 150-minute worship event on January 19, 2020. A passenger on bus 2 was the source patient. SARS-CoV-2 infection risks were compared among at-risk persons taking bus 1 (n = 60) and bus 2 (n = 67 [source patient excluded]) and among all other people (n = 172) attending the worship event. Experts found a higher risk of SARS-CoV-2 infection in people who rode a bus to a worship event with a patient with COVID-19 vs people who rode another bus to the same event. The high attack rate in the exposed bus was possibly because of an airborne spread of SARS-CoV-2. It is necessary that future efforts at prevention and control consider the potential for airborne spread of the virus.