(Nature) A new variant of H5N1 influenza could pose an increased risk to people and wild animals. An outbreak of avian influenza on a mink farm in Spain provides the strongest evidence so far that the H5N1 strain of flu can spread from one infected mammal to another. The outbreak of H5N1 flu, described in a report in Eurosurveillance on 19 January1, occurred on an American mink (Neovison vison) farm in Carral in October 2022. Genetic sequencing showed that the animals were infected with a new variant of H5N1, which includes genetic material from a strain found in gulls, as well as a genetic change known to increase the ability of some animal-flu viruses to reproduce in mammals.
Mink-farm outbreak shows bird flu can spread between mammals
