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SESK: Stuff Everyone Should Know · sesk.info/horse-wnv-dead-end

Can a horse with West Nile virus pass it directly to other horses?

No. Mosquitoes spread West Nile, and horses are dead-end hosts.

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  1. No, horses are dead-end hosts ✔
  2. Yes, by nose-to-nose contact
  3. Yes, through shared water buckets

Why: West Nile virus passes from birds to horses through mosquito bites. The AAEP calls horses dead-end hosts, so they do not spread it onward. Direct horse-to-horse contagion is not expected.

Huh, didn't know that: UMN Extension says West Nile is not contagious and cannot pass between horses or people.

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References

Answer: No, horses are dead-end hosts. West Nile virus passes from birds to horses through mosquito bites. The AAEP calls horses dead-end hosts, so they do not spread it onward. Direct horse-to-horse contagion is not expected.

  1. West Nile Virus Vaccination Guidelines (AAEP) aaep.org/resource/west-nile-virus-vaccination-guidelines
    Horses and humans are considered to be dead-end hosts for WNV.
    Checked 2026-10-10.
  2. West Nile Virus in horses (UMN Extension) extension.umn.edu/node/31686
    WNV is not contagious and can't pass between horses or humans.
    Checked 2026-10-10.

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