It is the combination of measures that reduce the risk, not only one
➡️Ventilation, filtration, well fitted masks (no gaps), distance, short time, not loud, less people, hygiene. All helps.
💜Thanks @fdiazmas @apinedarojas @urbanpowered @lachattenoire78 @tarashinon @AirborneKanki
@threadreaderapp please unroll
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