Fluvac Innovator EHV-4/1 provides protection against the risks of equine influenza (flu) and herpesvirus (rhino). Respiratory diseases such as equine influenza (flu) and equine herpesvirus (rhino) are classified as risk-based by the American Association of Equine Practitioners (AAEP) because their likelihood of occurrence depends on factors like travel or cohabitation with traveling horses. Due to their high contagiousness, flu and rhino are the top risk-based vaccinations recommended for horses.**We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.**