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CHICAGO (Reuters) - While many health experts see the H5N1 bird flu virus as a likely cause for an influenza pandemic, another influenza virus could just as likely mutate into a global killer, U.S. health experts said on Tuesday.
"You can not accurately predict if and when a given virus will become a pandemic virus," said Anthony Fauci, head of the U.S. National Institute of Allergy and Infectious Diseases.
Fauci said too little is known about exactly how and when a virus will mutate. Focusing too much on one suspect -- even a very likely suspect such as H5N1 -- may be a mistake.
"We should not ... forget the fact that historically pandemics have evolved. We should be building up the knowledge base and expanding the capabilities of making vaccines," he said in a telephone interview.