West Nile Virus in Mares and FoalsAt this time there is no evidence that the WNV causes abortions in our mares; only that there was evidence of the virus in the aborted fetuses.
Further testing and research is ongoing to determine the relationship between the WNV and abortion.
Vaccinating Mares and Foals
Renowned veterinarian Rob Holland, DVM, PhD, a private practitioner in Kentucky and a technical services veterinarian for the Intervet pharmaceutical company, explained the protocol for vaccinating brood mares.
recommends you vaccinate your mares four to six weeks BEFORE foaling,
what you're doing is bolstering their IgG (a type of antibody) and all
their immunological parameters.
In the case of the mare and the (unborn) foal, there's a six-layer placenta that does a very good job of protecting the foal against potential disease that affects the mare, and doesn't allow any antibodies to cross it.
Maternal vs. Foal Antibodies
W. David Wilson, MS, BVMS, MRCVS, of the Department of Medicine and Epidemiology in the School of Veterinary Medicine at the University of California, is recommending, based on information gathered from studies with other vaccines, that if the mares are NOT vaccinated against WNV or they haven't been exposed (which is now the situation for only horses in the far western states) that foals can be vaccinated starting at two to three months of age.
IMPORTANT NOTE: **Dr. Wilson would have serious concerns about vaccinating foals at such a young age if their dams WERE vaccinated or had been previously EXPOSED to WNV.
Studies with influenza, EEE, WEE, tetanus, rabies,
and EHV have shown that maternal antibody interference extends up to six
months and beyond. Therefore, many foals vaccinated at less than six
months of age fail to mount a protective immune response to
To avoid this problem, Wilson has recommended that veterinarians delay vaccination of foals from mares which were vaccinated or exposed to WNV until the foal is about six months of age.
Wilson recommends the following series:
FIRST vaccination at six months or older.
SECOND vaccination three to four weeks later.
THIRD vaccination six to eight weeks after the second dose of vaccine.
What Dr. Wilson and others have found with other vaccines is that many (foals) don't respond optimally after two doses of vaccine even when vaccination is started after maternal antibodies have waned.
A third dose gives a little more assurance that the ones that haven't responded to two doses will respond to the third dose.
Please check with your veterinarian for more information on WNV and when to vaccinate your mares and/ or foals.
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