Handmade masks are trending on social media, with Instagrammers posting
tutorial videos on how to construct them using handkerchiefs, scarves,
or even coffee filters and elastic bands.
https://english.kyodonews.net/news/2020/02/f6842e6babdb-feature-japanese-get-creative-in-face-of-coronavirus-crisis-mask-shortages.html
там же для известного эпидемиолога и дышателя говном О:
While some experts advise handwashing is more effective than wearing a
face mask or go as far as saying reusable masks are dangerous to your
health, many still believe that any mask is better protection than no
mask at all.
Virologists, on the other hand, have doubts about the effectiveness of
masks against airborne viruses, although there is some evidence to
suggest they can help prevent hand-to-mouth transfer.