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Equine Influenza

Orthomyxoviridae

QuestionAnswer
Previously equine influenza A1: A/H7N7
Previously equine influenza A2: A/H3N8. Variant of this virus causes influenza in dogs. VERY UNSTABLE under ordinary environmental conditions
Transmission? Carrier state? Shedding? Aerosolized infectious exudates. NONE. Horses can shed virus up to week following recovery
Pathogenesis? Replicates in the epithelial cells of the respiratory tract so lesions like laryngitis, tracheitis, bronchitis, and other URT infections
Clinical signs? Rapid spread, high fever, dry, hacking paroxysmal cough: ABORTION in mares with prolonged fever
Recovery? Mortality? within 7-10 days. Mortality is rare but MORE FREQUENT if there is an intercurrent bacterial infection
What are the horses vaccinated with? bivalent inactivated H7N7 and H3N8 antigens
Created by: lkollmeier
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