Anthony Fauci, head of the U.S. National Institute of Allergy and Infectious Diseases, can be a poopy head at times, but he is very correct in this Reuters article.
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.