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As bird flu continues to spread among U.S. dairy cows, reassuring new government research finds the pasteurization process widely used in the industry effectively kills all bird flu virus in milk. In a health update posted Friday, the U.S. Food and Drug Administration (FDA) said the results are the latest to show that pasteurized grocery store milk remains safe from the highly pathogenic avian virus H5N1. “These results complement the FDA’s retail sampling study, in which all 297 samples of dairy products collected at retail locations were found to be negative for viable H5N1 HPAI virus,” the agency said in its update. “Collectively, these studies provide strong assurances that the commercial milk supply is safe.” The most recent research came about because scientists at the FDA and the U.S. Department of Agriculture (USDA) were trying to replicate the exact conditions under which milk is pasteurized in this country. “We had a lot of anecdotal evidence. But we wanted to have direct evidence about HPAI [H5N1] and bovine milk,” Dr. Don Prater, acting director of the FDA’s Center for Food Safety and Applied Nutrition, told CBS News. “So, we began to build this custom instrument that replicates, on a pilot scale, commercial processing [of milk].” Earlier research had not been quite as convincing: Scientists at the National Institutes of Health (NIH) found that some bits of infectious bird flu virus were… read on > read on >