 with further testing showing that a quarter of these contained infectious virus. However, the FDA was keen to stress that the study was not specifically designed to assess the prevalence of the virus in milk and that the numbers might not be more widely representative. The goal of the study was to determine what range of viral load might be present in raw milk samples from farms that routinely send products for pasteurization, not to determine statewide or national H5N1 virus prevalence,