The outbreak of avian influenza in US dairy cattle shows no signs of slowing. Over the past three weeks, the number of states where cows infected with bird flu have been detected has risen from six to eight. A preprint1 posted on 16 April reported the discovery of the virus in raw milk from infected cows, and US federal authorities said on Wednesday that the virus had been found in lung tissue collected from a seemingly healthy cow. Detection of viral particles in milk sold to consumers suggests that avian flu in cows could 'be more widespread than initially thought', says food scientist Diego Diel at Cornell University in Ithaca, New York. 'Increased surveillance and testing in dairies should be an important part of control measures going forward.' Nature looks at the implications for human health and the future of the outbreak. After it leaves the farm and before it hits the shelves, milk is pasteurized to inactivate pathogens. To detect H5N1, the FDA used a test called...
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