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Emergency vaccination; (a) efficient or (b) inefficient vaccination buffer zone. The age to vaccinate foals against equine influenza A virus (EIV) is variable and will depend of the EI vaccine used (i.e., usually from 4 to 11 months of age for most Equine Influenza (EI) vaccines commercialized) and the presence of maternal-derived antibody (if the mare was vaccinated during pregnancy).
