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celiawhitmore

Equine Influenza

Equine Influenza

The H7N7 and H3N8 subtypes of the equine influenza virus are the two that cause equine influenza. Although the H7N7 subtype caused outbreaks in the middle of the 20th century, it has been thought to be extinct since it hasn’t been isolated in almost 20 years. Since its emergence in the late 1950s, the H3N8…