DIGICOMPHOTO/SCIENCE PHOTO LIBRARY/Getty Images(NEW YORK) -- Public health officials are continuing to monitor as an outbreak of avian flu, also known as bird flu, continues to spread across the country.The strain, known as H5N1, has sickened several mammals this year, according to the Centers for Disease Control and Prevention (CDC), the U.S. Food and Drug Administration (FDA) and the U.S. Department of Agriculture (USDA).Several dairy cows have been infected, resulting in milk samples showing inactive remnants of the virus, and one human case has been confirmed.Health officials say the food ...