A strain of bird flu known as H5N1 or highly pathogenic avian influenza has made a worrying leap to cattle herds across the US over the past month. This development has sparked “enormous concern” among health experts, including the World Health Organization’s (WHO) chief scientist, who warned of the virus’ “extremely high” mortality rate in humans.
Avian flu does regularly jump to humans yes, but usually it’s directly from the birds. The big risk this time is the fact that it’s already spreading between mammals meaning that it’s more likely for it to mutate to allow for human to human transmission.