There has never been any evidence of any prion being transmitted through milk. Although, we don't know if prions can occur in the milk of a cow with BSE, there is very good epidemiologic evidence that this is not a route of transmission. For example, if the BSE prion was transmitted in cow s milk, wouldn't we expect to see BSE in calves fed on such milk? There are solid data from the UK that such calves have not become infected.