Concern that the world could be on the brink of the first influenza pandemic in more than 40 years escalated Sunday as France, Hong Kong, New Zealand and Spain reported potential new cases in which people had been infected with swine flu and Canada confirmed several new cases. In the U.S., where 20 such infections have been confirmed, federal health officials declared a public-health emergency and are preparing to distribute to state and local agencies quarter of the country's 50 million-dose stockpile of antiviral drugs. Meanwhile, in hard-hit Mexico, where more than 80 people have died from what is believed to be swine flu, the government closed all public schools and canceled hundreds of public events in Mexico City.
Though the World Health Organization (WHO) is referring to the situation as a "public-health emergency of international concern," the apparent emergence in several countries of an entirely new strain of H1N1 flu virus has led some scientists to believe that it is only a matter of time before the WHO declares pandemic status, a move that could prompt travel bans to infected countries.
Health officials in Washington were quick to point out Sunday that none of the 20 cases identified in the U.S. so far has been fatal; all but one of the victims has recovered without needing to be hospitalized. Officials also noted that only one American has been infected so far who had not recently traveled to Mexico - a woman in Kansas got sick after her husband returned from a business trip in that country, where he became ill - but that could change as more intensive disease surveillance begins. "As we continue to look for more cases, I expect we're going to find them," said acting Centers for Disease Control (CDC) director Richard Besser.
Right now health officials around the world are trying to take precautions without inciting panic. Here are just a few of the questions facing them - and ultimately, us as well:
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Toll in Mexico's flu epidemic rises to 103