Masks May Not Help in Stopping Flu

Face masks are everywhere in Mexico City as people try to protect themselves from swine flu, the Associated Press says. The government has handed out millions of them. But U.S. officials say there’s little evidence that they help to prevent the spread of flu. The U.S. Centers for Disease Control and Prevention has not advised the public to use them. Some experts say masks might even cause harm. This could occur if people who wear them fail to take other precautions such as washing hands often.