H5N1 influenza has now been detected in pigs. This was something virologists had been worrying about ever since this highly pathogenic strain of bird flu started its rapid global spread in 2020. But why were we worrying specifically about pigs? And does this case – detected on a farm in Oregon on October 29 – change anything?
It might seem odd that we care about it at all. In many ways, the initial reports of this case are – against the backdrop of a continuing viral outbreak that has devastated seabird colonies around the world, caused huge die-offs of sea lions and led to the emergence of an entirely new disease of US dairy cattle – pretty innocuous.
What we currently know is this: H5N1 bird flu infected poultry on a small American non-commercial farm, something which is sadly now quite common. In this case, there were other animals on the farm, including five pigs. Although the pigs appeared to be healthy, a nasal swab from one of them was found to contain H5N1.
