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LONDON (AP) - The World Health Organization's flu chief said the swine flu virus has now become the predominant flu strain worldwide.
In some countries, swine flu accounts for up to 70 percent of the flu viruses being sampled, said Dr. Keiji Fukuda, WHO's top flu official.
While most people recover from the illness without needing medical treatment, officials are also continuing to see severe cases in people under 65 — people who are not usually at risk during regular flu seasons.
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