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Cold, Flu, & Cough Health Center

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Swine Flu (H1N1) and Face Masks

When and how to use face masks in home and community settings.
WebMD Feature
Reviewed by Louise Chang, MD

News coverage of swine flu outbreaks almost always shows people wearing face masks. Do they really need them to protect against H1N1 swine flu? Do you?

Here's what you should know:

Swine Flu Outbreak: Get the Facts

Swine Flu Slideshow

Learn more about the H1N1 swine flu and see what you can do to stay healthy.

View the slideshow.

What Is a Face Mask?

  • Face masks are sold as surgical masks, dental masks, medical procedure masks, isolation masks, or laser masks. There are several designs; some tie around the head, some have elastic bands around the head, and others have ear loops. Price range: $10 to $15 for a box of 50.
  • Washable, reusable face masks should be used only if disposable masks are not available. But none of these reusable masks has been evaluated by the FDA and none can legally be sold to protect against disease.
  • N95 respirators are face masks that fit more tightly to the face. They filter out 95% of small particles when correctly fitted, although this isn't easy to do in the home setting. Price range: $10 to $60 for a box of 20.
  • Bottom line: Nobody knows whether face masks or respirators really protect against flu. The recommendations below, from the CDC, are experts' best guesses as to the best way to use them.

Do Face Masks Work Against Swine Flu?

  • There's limited evidence -- but no proof -- that face masks offer some protection against H1NI swine flu.
  • One study shows that when there's a sick family member in the house, other family members could cut their risk of getting sick by 60% to 80% by using face masks consistently and correctly -- in combination with frequent hand washing and avoiding close contact with the sick person.
  • Face masks rated as N95 masks -- technically called respirators -- should theoretically work better than surgical masks, which fit more loosely. But at least one study shows no difference in protection in household settings.
  • Ferret studies suggest that swine flu is spread by large droplets and not by small droplets. All face masks may protect against large droplets; N95 masks may protect against smaller, aerosolized droplets.
  • Studies consistently show that most people in household and community settings don't use face masks consistently or correctly.

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