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equine influenza
Equine influenza (horse flu) is the disease caused by strains of influenza A that are enzootic in horse species. Equine influenza occurs globally, and is caused by two main strains of virus: equine-1 (H7N7) and equine-2 (H3N8). The disease has a nearly 100% infection rate in an unvaccinated horse population with no prior exposure to the virus.
While equine influenza is historically not known to affect humans, impacts of past outbreaks have been devastating due to the economic reliance on horses for communication (postal service), military (cavalry), and general transportation. In modern times, though, the ramifications of equine influenza are most clear in the horse-racing industry.
==Characteristics==
Equine influenza is characterized by a very high rate of transmission among horses, and has a relatively short incubation time of one to five days. Horses with horse flu can run a fever, have a dry, hacking cough, have a runny nose, and become depressed and reluctant to eat or drink for several days, but they usually recover in two to three weeks.〔(University of Sydney RIRDC equine research and development website )〕
An 1872 report on equine influenza describes the disease as:
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