Equine Influenza Vaccine Protocols: Boosters are Best

A 300-horse study sought to find the vaccination protocol that best prevents flu in horses--intranasal (IN) or intramuscular (IM), given as a single dose or two doses given 30 days apart (boosted). Researchers also looked at boosting an initial IM dose with an IN dose, and vice versa. Unsurprisingly, all horses receiving a booster dose of either vaccine had significantly higher levels of pro...

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