Officials said the virus was likely to be carried into either the east or west coast of the United States by migrating birds starting their journeys south, either from Alaska on the Pacific Flyway, or the Atlantic Flyway on the other side of North American continent.
They said some 60,000 birds, mostly waterfowl, would begin their migration south from Alaska in mid-August, working their way down through Oregon, Washington and into California.
They said some 60,000 birds, mostly waterfowl, would begin their migration south from Alaska in mid-August, working their way down through Oregon, Washington and into California.
The H5N1 virus overwhelmingly infects birds but has sickened 186 people in eight countries and killed 105 of them. Experts believe it poses the greatest threat in recent years of a global flu pandemic that could kill millions, if it acquires the ability to pass easily from human to human.
U.S. Health and Human Services Secretary Michael Leavitt warned against panic when avian flu hits U.S. shores for the first time, saying it would not inevitably mean the start of a human pandemic.
"It is almost certain that a wild bird will find its way into the United States with H5N1 on board. That will not be a crisis," Leavitt told reporters in Los Angeles.
But he warned states to lay the groundwork for possible human to human transmission. "There is clearly a lot of buzz (but) I worry there is not enough busy-ness," he said.
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