> For instance, I saw everybody wearing a mask at Singapore airport but I couldn't find any official recommendation saying to do so, unless you're sick. So shou

> For instance, I saw everybody wearing a mask at Singapore airport but I couldn't find any official recommendation saying to do so, unless you're sick. So should I wear a mask? People working at the airport would be encouraged to wear masks because they're in contact with travellers all day. Travellers might wear masks because Singapore's just below China and the cruise ship for reported infections. (Singapore has also been actively tracing people and reporting the cases as they happen; I think some other countries aren't taking as active an approach.) For most Singaporeans, it's business as usual. I take the trains every day, and somewhere between 10%–20% of commuters wear masks.