(Merial) Equine Potomavac + Imrab Rabies Vaccine is recommended for the vaccination of healthy horses against rabies and as an aid in the prevention of Potomac Horse Fever (equine monocytic ehrlichiosis) caused by E. risticii. Give 1 ml intramuscularly to horses 3 months of age or older. Give a booster dose 3 to 4 weeks later, using this product or Potomavac. Revaccinate annually with a single 1 ml dose of Equine Potomavac + Imrab. Order syringes and needles separately.