Federal officials said that muscle from a sick dairy cow had tested positive for the virus, but reiterated that the commercial meat supply was safe.Federal officials said that muscle from a sick dairy cow had tested positive for the virus, but reiterated that the commercial meat supply was safe.Read MoreAvian Influenza, Food Contamination and Poisoning, Food, Beef, Agriculture Department, Cattle, Viruses, Hamburgers, Meat, your-feed-science, your-feed-healthNYT > Health