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SESK: Stuff Everyone Should Know · sesk.info/horse-wnv-spring-shot

When does the AAEP say to give a previously vaccinated adult horse its West Nile shot?

Yearly, in the spring, ahead of the insect season.

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  1. Only in late winter
  2. Yearly in spring, before mosquito season ✔
  3. Every ten years

Why: West Nile shots protect best when given before mosquitoes are out. The AAEP says to vaccinate previously vaccinated adults every spring, before insect season. Some higher risk horses may need extra doses.

Huh, didn't know that: The AAEP says horses over 15 are more susceptible to West Nile disease, so more frequent shots may be recommended.

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References

Answer: Yearly in spring, before mosquito season. West Nile shots protect best when given before mosquitoes are out. The AAEP says to vaccinate previously vaccinated adults every spring, before insect season. Some higher risk horses may need extra doses.

  1. West Nile Virus Vaccination Guidelines (AAEP) aaep.org/resource/west-nile-virus-vaccination-guidelines
    Vaccinate annually in the spring, prior to the onset of the insect vector season.
    Checked 2026-10-10.
  2. West Nile Virus Vaccination Guidelines (AAEP) aaep.org/resource/west-nile-virus-vaccination-guidelines
    have been demonstrated to have enhanced susceptibility to WNV disease
    Checked 2026-10-10.

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