The Department of Medicine and Epidemiology at the University of California, Davis, has confirmed that one horse tested positive for equine influenza. Veterinarian William Gray said about half of the 25 horses he is tending to are exhibiting signs of the illness, including high fever, lethargy, nasal discharge and coughing. Dr. Gray said he is particularly concerned the flu strain may be rather virulent, as the ill horses are between eight and 10 years old, much older than is normal for flu to quickly spread.

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