Prevention of COVID-19 superspreading events in buses boarded by presymptomatic cases.

Introduction: COVID-19 superspreader events have occurred when symptomatic individuals without wearing face masks boarded buses.

Objective: To report the risk of superspreader events when presymptomatic individuals boarded buses to-gether with unvaccinated passengers, but with non-pharmacological preventive interventions being maintained.

Methods: Prospec-tive study of health personnel transported in buses to a COVID-19 vaccination center for two weeks.