• Eric Ochoa-Hein, Martha A Huertas-Jiménez, Alma R Chávez-Ríos, Anabel Haro-Osnaya, Paz-GarcíaRoxana deRSubdirectorate of Hospital Epidemiology and Medical care Quality Control., Alberto G Colín-Ugalde, Patricia E Leal-Morán, Abril T Vargas-Fernández, José F Vargas-Fernández, Ricardo González-González, Sandra Rajme-López, María F González-Lara, Alfredo Ponce-de-León, José Sifuentes-Osornio, and Arturo Galindo-Fraga.
• Subdirectorate of Hospital Epidemiology and Medical care Quality Control.
• Gac Med Mex. 2022 Jan 1; 158 (4): 196-201.

IntroductionCOVID-19 superspreader events have occurred when symptomatic individuals without wearing face masks boarded buses.ObjectiveTo report the risk of superspreader events when presymptomatic individuals boarded buses to-gether with unvaccinated passengers, but with non-pharmacological preventive interventions being maintained.MethodsProspec-tive study of health personnel transported in buses to a COVID-19 vaccination center for two weeks. Open windows, correct use of face masks and exclusion of symptomatic individuals were mandatory. Prospective surveillance identified workers with COVID-19 within 14 days after vaccination. Each asymptomatic passenger of buses where cases were identified was monitored for a similar time period. Voluntary screening results were available for workers who were tested in the month before or after vaccination.Results1,879 workers boarded 65 buses. On-board time ranged from three to eight hours. Twenty-nine cases of COVID-19 and four asymptomatic cases were identified among 613 passengers of 21 buses. Median time between vaccina-tion and COVID-19 symptoms onset was six days. One case of suspected transmission on a bus was identi-fied.ConclusionsStrict nonpharmacological preventive interventions substantially reduced the risk of COVID-19 super-spreader events in buses boarded by presymptomatic individuals.Copyright: © 2022 Permanyer.

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