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Gaceta médica de México
versión On-line ISSN 2696-1288versión impresa ISSN 0016-3813
Resumen
OCHOA-HEIN, Eric et al. Prevention of COVID-19 superspreader events in buses boarded by presymptomatic patients. Gac. Méd. Méx [online]. 2022, vol.158, n.4, pp.204-209. Epub 30-Sep-2022. ISSN 2696-1288. https://doi.org/10.24875/gmm.21000772.
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 together with unvaccinated passengers, but with non-pharmacological preventive interventions being maintained.
Methods:
Prospective 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.
Results:
1,879 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 vaccination and COVID-19 symptoms onset was six days. One case of suspected transmission on a bus was identified.
Conclusions:
Strict nonpharmacological preventive interventions substantially reduced the risk of COVID-19 superspreader events in buses boarded by presymptomatic individuals.
Palabras llave : COVID-19; SARS-CoV-2; Presymptomatic disease; Transmission; Face mask.