Face masks help prevent swine flu infection?

Japanese medical authorities say that it's very important to prevent swine flu to wash your hands, rinse your mouth and wear face mask. I believe that wash your hand and rinse your mouth are effective way. But I doubt whether face mask can prevent swine flu.

It might be true that some surgical masks help stop droplets from spreading, if used correctly, flu mask are more likely to reduce flu risk, at least better than not to wear them. But honestly speaking, you can't count on those disposable masks to completely protect you against the swine flu.

Before swine flu is raging, I have been in a habit of washing  my hands with soap. It's far more important than flu mask.