Masks are everywhere in Asia, but have they helped?

In parts of Asia, mask-wearing has been a key response to the outbreak

The use of face masks in Asia during the coronavirus outbreak has been far more widespread than in the West, where governments have urged people to reserve supplies for frontline medical staff, so have they helped limit infections?

Experts agree that the ordinary surgical masks commonly worn in parts of Asia during cold and hayfever seasons are not a foolproof way to prevent coronavirus infection.