Thicker mask needed to block spread of flu illnesses. The U.S. government said it's reviewing recommendations on the use of surgical masks to protect health-care workers from flu after a study showed they don't help. Thicker, more expensive respirators should be used, the study found. [News Source]

Thicker mask needed to block spread of flu illnesses. The U.S. government said it's reviewing recommendations on the use of surgical masks to protect health-care workers from flu after a study showed they don't help. Thicker, more expensive respirators should be used, the study found. [News Source]