I've heard (and seen) that in JP, people wear masks to protect other people from sickness. That said, I don't think I've seen an example of a debilitatingly si

I've heard (and seen) that in JP, people wear masks to protect other people from sickness. That said, I don't think I've seen an example of a debilitatingly sick person wearing a mask; only their caregivers wear masks. A seriously sick person has no ability to receive the training and certification to wear an N95 mask. Besides infected people are contagious before they're symptomatic so no one would know to suggest they wear a mask. Early warning nasal swab? Pillow mounted HEPA filter? I'm not sure we know about enough about transmission to really understand how to prevent it...