Federal testing on more retail dairy products finds no live H5N1 virus Testing included different cheeses, including some aged varieties made from raw milk, butter, ice cream, and milk8 January 2025 8 January 2025 3 minute read 3 minute read By: By: University of Minnesota Extension North AmericaA second round of testing of retail dairy products, which includes more products such as cheese and butter and from a broader geographic area, found no live H5N1 avian flu virus in any of the samples, federal officials said in December. He said since dairy products aren't always made where the milk was collected, so it's hard to pinpoint the source for products that had virus traces. If live virus were found, however, scientists could unblind the samples and take steps to trace the products. Too soon to say if virus ebbing in dairy cattleAt today's briefing, Deeble said it's too soon to say if federal officials have gotten ahead of the outbreaks in dairy cows. Grube said federal officials remain in contact with state regulators to best understand how and where to test milk in the supply chain.