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Some links claim one can spread covid merely by breathing (not talking):

Currently available research supports the possibility that SARS-CoV-2 could be spread via bioaerosols generated directly by patients’ exhalation

My question is: if someone say person A enters a room which activity carries more risk in terms of becoming infected from person A:

  • activity 1: A is silent in room all time

  • activity 2: A talks

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Activity 2 carries more risk of transmission : talking is associated with more droplets being exhaled in the room's air.

However, Activity 1 cannot be considered as completely devoid of droplet generation.

This article published in Nature gives informations on aerosol transmission https://doi.org/10.1038/s41598-020-69286-3

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