More info on the strain itself:
“Confirmation has also been received that the strain of the virus is the “Florida Clade 1” strain, which is endemic to North and South America, and is different from Clade 2 strain that is endemic to Europe. British horses are vaccinated against both Clade 1 and Clade 2, but this is clearly more virulent than the European strain and therefore able to affect vaccinated horses, though the vaccine will provide some protection. The Animal Health Trust provides more detailed information: https://www.aht.org.uk/disease-surveillance/equiflunet/equine-influenza-vaccines.”
“Confirmation has also been received that the strain of the virus is the “Florida Clade 1” strain, which is endemic to North and South America, and is different from Clade 2 strain that is endemic to Europe. British horses are vaccinated against both Clade 1 and Clade 2, but this is clearly more virulent than the European strain and therefore able to affect vaccinated horses, though the vaccine will provide some protection. The Animal Health Trust provides more detailed information: https://www.aht.org.uk/disease-surveillance/equiflunet/equine-influenza-vaccines.”
