Schon der einfache Mundschutz aus einem Halstuch wäre besser als nichts.

Ein seriöse Quelle:

https://www.weforum.org/agenda/2020/03/who-should-wear-a-face-mask-30-march-who-briefing/

Should you wear a face mask? WHO officials weigh in at today's COVID-19 briefing

WHO officials do not recommend mask wearing for healthy members of the general population.

Still, mask wearing by the general public is not among the WHO’s recommendations. “We don’t generally recommend the wearing of masks in public by otherwise well individuals because it has not up to now been associated with any particular benefit,” said Ryan.

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"Wenn ihr euch fragt, wie es damals passieren konnte:
weil sie damals (...)."
Henryk Broder