U.S. health officials warned of futher spread of Type A H1N1 influenza, and a top global health official predicted up to a third of the world's population could eventually become infected.

Asian countries have seen few cases so far, and officials there say they will increase stockpiles of flu medicine and cooperate in an emergency. They cite Asia's dealings with SARS and their own dealings with avian flu as reasons not to take chances with this new epidemic.

U.S. officials the Type A H1N1 virus to spread to all 50 states and to cause many infections, ranging from mild to severe. There have been only two deaths in the United States, both individuals had additional health complications and one was a resident of Mexico City who was visiting the United States.

While the flu cases have generally been mild, the spread is continuing, notes Richard Besser, acting director of the U.S. Centers for Disease Control and Prevention. "So far we are not seeing any signs of this petering out."

A batch of detailed studies on the Type A H1N1 strain shows that it is an unusual triple-hybrid mixture, involving pig, human and bird elements and a European swine virus not seen before in North America.

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