The WHO say that to use a mask safely:

• Hands must be cleaned before putting on your mask, as well as before and after taking it off, and each time you touch it.

• Ensure it fits and covers your nose, mouth and chin.

• Once a mask is removed, it should be stored in a clean plastic bag. If it is a fabric mask it should be washed daily; if it is a medical mask it should be thrown away.

• WHO say masks with valves should not be used (they protect the wearer but may not protect others).

Dr Jane now works on COVID-19 advice on Nepali radio; her first audiobook is just launched.