One in Five Milk Samples Has Bird Flu Virus Fragments, Suggesting Cow Infections Are More Widespread Than Thought Experts say the pasteurization process likely kills the virus, and tests are likely just detecting remnants of the dead virus. Spencer Platt / Getty Images One in five samples of grocery store milk tested positive for bird flu virus, according to initial results from a nationally representative survey conducted by the Food and Drug Administration (FDA), the agency announced Thursday. Preliminary research suggests the virus in grocery store milk is not infectious. “To date, the retail milk studies have shown no results that would change our assessment that the commercial milk supply is safe,” the FDA says in the statement... I'm not worried...