COVID‐19 – Face mask protects others when coughing in bus.

130 min. – without mask, 39 in coachbus: 5 infected.
50 min. –        with mask, 14 in mini bus: 0 infected.
COVID-19 : Face Masks and Human-to-human Transmission, LETTER TO THE EDITOR, Influenza Other Respir Viruses. 2020 Mar 29.

COVID-19 – medical masks as bad as N 95.

Only one trial evaluated coronaviruses separately and found no difference between the two groups … Low certainty evidence suggests that medical masks and N95 respirators offer similar protection against viral respiratory infection including coronavirus in health care workersMedical Masks vs N95 Respirators for Preventing COVID-19 in Health Care Workers A Systematic Review and Meta-Analysis of Randomized Trials, Influenza Other Respir Viruses. 2020 Apr 4.

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