H5N1 virus can survive in raw milk cheese unless the cheese is highly acidic, like feta. The research suggests acidity and careful milk testing could help cheesemakers prevent contamination. Credit: Shutterstock Cheese made from contaminated raw milk was found to contain infectious avian influenza virus, raising potential health concerns for consumers, according to new research. The study also found that no virus was detected in samples of raw milk cheese with high acidity. Feta cheese, which