As the H5N1 bird flu virus mutates and rapidly spreads through American cattle herds — a first for the U.S. — doctors and veterinarians are fearful that if the virus is left unchecked ...

"Influenza has always been underestimated ... the lowest since the 2011-2012 season, according to CDC estimates. Among adults 18 and older, 44.9% were vaccinated last season — the lowest ...