WASHINGTON -- The world's governments raced to avoid both a pandemic and global hysteria Sunday as more possible swine flu cases surfaced from Canada to New Zealand and the United States declared a public health emergency. "It's not a time to panic," the White House said.

Catholics who entered a closed door mass line up for a communion wafer from Mexico's Carinal Norberto Rivera, right, at the Metropolitan Cathedral in Mexico City, Sunday, April 26, 2009. [Agencies]more photos

The US declared the health emergency so it could ship roughly 12 million doses of flu-fighting medications from a federal stockpile to states in case they eventually need them -- although, with 20 confirmed cases of people recovering easily, they don't appear to for now.

"We do think this will continue to spread but we are taking aggressive actions to minimize the impact on people's health," said Dr. Richard Besser, acting chief of the Centers for Disease Control and Prevention.

"Really, that's what we're doing right now. We're preparing in an environment where we really don't know ultimately what the size or seriousness of this outbreak is going to be," Homeland Security Secretary Janet Napolitano told reporters.

Earlier, White House press secretary Robert Gibbs said the outbreak was serious, but that the public should know "it's not a time to panic." He told NBC's "Meet the Press" that Obama was getting updates "every few hours" on the situation.

In Mexico, soldiers handed out 6 million surgical-style masks to deal with a deadly flu strain that officials say may have sickened 1,400 people since April 13. Special laboratory tests to confirm how many died from it -- 22 have been confirmed so far out of 86 suspected deaths -- are taking time.

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