Mexican soldiers carry packages of masks to be distributed in Mexico City April 25, 2009. A new flu that has killed up to 68 people in Mexico could start a global epidemic, the World Health Organization warned on Saturday, as tests showed the strain might be spreading in the United States. Reuters Pictures logo Reuters Pictures 34 months ago

Mexican soldiers carry packages of masks to be distributed in Mexico City April 25, 2009. A new flu that has killed up to 68 people in Mexico could start a global epidemic, the World Health Organization warned on Saturday, as tests showed the strain might be spreading in the United States.