Equine Influenza — United States
The incubation period of influenza is approximately 1-3 days. Clinical signs begin abruptly and include high fever (up to 106 deg F [41.1 deg C]), serous nasal discharge, submandibular lymphadenopathy, and coughing that is dry, harsh, and nonproductive. Depression, anorexia, and weakness are frequently seen. Clinical signs usually last less than 3 days in uncomplicated cases. Influenza virus replicates within respiratory epithelial cells, resulting in destruction of tracheal and bronchial
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