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Zoetis' Equine Vaccine Approved for Extended Use
USAgNet - 09/23/2016

Zoetis announced LEPTO EQ INNOVATOR, the only equine leptospirosis vaccine against L. pomona, received additional approval for use in broodmares for all three trimesters of pregnancy. Field safety studies, which examined the vaccine when used in the first, second and third trimesters of pregnancy, showed no systemic or local reactions to vaccination.

"Leptospires can cause late-term abortion in mares," said Jacquelin Boggs, DVM, MS, ACVIM, senior veterinarian, Equine Technical Services at Zoetis. "The expanded label claim allows the equine breeding community the flexibility to use LEPTO EQ INNOVATOR to fit their breeding program's needs and help elevate antibody titer levels when most needed."

A study showed that 13% of bacterial abortions are caused by L. pomona, the most common leptospiral serovar found in horses. Aborting mares have been reported to shed leptospires in their urine for periods up to three months and can transmit Leptospira to exposed animals.

Some horses aborting due to leptospiral infection develop uveitis several weeks to months later. Additionally, the aborted fetus is a source of exposure to other horses on the property.


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