Cow flu virus takes 'dangerous step towards infecting humans through respiration'
![Cow flu virus takes 'dangerous step towards infecting humans through respiration'](https://e3.365dm.com/24/05/1920x1080/skynews-dairy-cows-farm_6542024.jpg?20240503174337)
The cow flu virus that has spread through US dairy herds may have taken a "dangerous" step towards being able to infect humans through respiratory infections, scientists have warned.