Strangles is a highly contagious upper respiratory tract infection spread by direct or indirect contact with infected horses. Horses of all ages are susceptible to Strangles, which is caused by Steptococcus equi infection. Strepvax II is an equine vaccine approved for vaccinating healthy horses of all ages as an aid in the prevention of Strangles due to Streptococcus equi infection. Strepvax II contains a killed bacteria and is well tolerated by most horses. When combined with good hygiene and isolation of affected individuals, Strepvax II will help to limit the occurrence of clinical disease. This is the only S. equi vaccine that can be administered to horses intramuscularly (IM), providing ultimate convenience. Equine strangles vaccine Helps protect horses against Streptococcus equi infection For use in healthy horses and foals of all ages Contains killed bacteria, does not require mixing Convenient intramuscular (IM) administration All vaccines are shipped Express 1-2 Days. A $29.95 flat rate fee is charged for all orders containing vaccines. Someone should be present to sign for and receive the vaccine order when it ships to you. For more shipping info click here. NOTE: This item cannot be shipped to Minnesota, Canada and P.O. Boxes. Use must be approved by your veterinarian.