In the Brisbane suburb of Hendra, authorities in Queensland, Australia, were advised of acute respiratory disease in horses at a stable in September 1994. By the end of September, 13 horses had died. The sick horses were anorexic, depressed, usually febrile, had an elevated respiratory rate, and became ataxic. Head pressing was occasionally noted and a frothy nasal discharge occurred before death. Two humans working with the horses also developed respiratory illness with fever and myalgia. One man died, and the other remained ill for 6 weeks (20).

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