Vaccinate your horse for EIV to help prevent contraction.
EIV can be difficult to control by management practices alone as often horses travel and are mixed with other horses in her situations. The EIV vaccine can help control EIV contraction. An EIV vaccine schedule is as follows:
2nd Vaccine (21-92 days after the first)
3rd Vaccine (150-215 days after second)
Booster Vaccine given 365+ days from last vaccination.