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Canine flu is a viral infection caused by different varieties of the Influenza Virus A, a viral agent known to cause equine flu. The most common of these viruses is the equine influenza virus H3N8. In fact, the first instance of canine flu occurred in the horserace tracks of Florida where greyhounds were also raced and therefore exposed to the virus.

Although canine influenza virus has been tested positive in dogs earlier, it was only in 2004 that it was discovered that the virus could also cause influenza in dogs. The virus affects the canine respiratory system and causes this highly contagious disease that can pass on from one dog to another.

Canine influenza or dog flu was first identified in early 2005. This was after the outbreak of an epidemic of a dog respiratory system disease in the greyhound racetracks in Florida. A major outbreak of the disease was reported in New York State and by 2006 it had spread to 22 states of USA and believed to affect almost 16% of the dogs, with a mortality rate of 7%.

The canine influenza virus (CIV) belongs to the same family as the equine influenza virus, which has been around since the last forty years and more. It is understood that the contagion occurred on the racing tracks as the same tracks are used for greyhound as well as horse racing.

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