There is no evidence of the swine flu virus spreading in a sustained way outside North America, a top World Health Organization official says.
http://www.who.int/en/
Symptoms of swine and seasonal flu include fever, cough, sore throat, body aches, headache, chills, and fatigue.
The virus breeds in tissues of the respiratory tract, not on the skin however warm and damp it may get. Surgical masks, as seem to be handed out in Mexico, are designed to prevent transmission of disease rather than prevent its acquisition. Masks will certainly become less effective as they become damp and more porous, so masks would have to be changed several times per day to be of any value. The UK government has not stockpiled masks as part of its pandemic preparedness plan, although there have been reports of the government now ordering supplies of masks.
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