Do masks offer protection from viruses?

Masks can prevent the wearer from picking up germs left on surfaces by someone who is sick. — ZULAZHAR SHEBLEE/The Star

People around the world are buying up protective face masks in hopes of keeping the new virus from China at bay.

Some companies have required them for employees. Schools in South Korea have told parents to equip their children with masks and hand sanitiser when they return from winter vacation.