A sometimes-fatal virus that recently emerged in the nation’s greyhound racetracks and has spread to pet dogs in several states appears to be a new strain of influenza normally found in horses, experts report.They also note something relatively unique about the new strain: Unlike other “species-jumpers” like avian flu, this virus appears to pass quite easily from dog to dog.The virus poses no health threat to humans, but has proven fatal for some of the infected dogs. Infection has been reported in pet dogs in Florida, New York and possibly Massachusetts, experts at the Centers for Disease Control and Prevention (CDC) said in a press conference held Monday.
