Flu from horses is racing among dogs
By Ben Harder
A highly contagious influenza virus that has killed greyhounds and made other dogs ill may have first jumped to canines from a single infected horse, a genetic analysis suggests. The equine flu that sparked the epidemic appears to have evolved recently to spread readily among dogs.
The first signs of the virus’ horse-to-dog leap emerged at a racetrack in Florida in January 2004. A respiratory illness there killed 8 greyhounds and sickened 14 others. Virologists identified the cause as an influenza A virus of type H3N8, which had been known to infect horses but not dogs or people.