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Potomavac® Potomac Horse Fever Vaccine

Potomavac® Potomac Horse Fever Vaccine
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  • 1 ml dose vial Was: $19.59 Now: $14.69


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We strongly recommend air service to ensure your vaccines arrive in peak condition. Due to the temperature sensitivity of vaccines, we will not be able to replace or accept returns on vaccines that are shipped ground service.

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Frequently Asked Questions

Q.  Why vaccinate your horse?
A.  Vaccination may be the only way to help protect horses from some diseases, preventing disease causes less stress than recovery from infection, and many diseases cause permanent damage or death.

Q.  What is Potomac Horse Fever (PHF) and how is it transmitted?
A.  PHF has been something of a mystery to researchers for nearly 30 years. It was named after the river where it was first discovered, but it has been detected in many parts of the United States and Canada. It is usually found near bodies of water, but also has been found in areas as remote and arid as northern Wyoming.

PHF has a complex life cycle that is believed to involve bacteria, flukes, snails and aquatic insects, such as caddisflies and mayflies.

Q.  What are the signs of PHF?
A.  Signs can include:
  • Depression
  • High fever (102 - 107°F [38.8 - 41.7°C])
  • Colic, watery diarrhea
  • Leukopenia
  • Abortion
  • Laminitis

Q.  How can I help prevent my horse from being infected with PHF?
A.  Ways to help prevent infection with PHF include reducing populations of aquatic insects:
  • Use approved insecticides
  • Use netting
  • Reduce the use of nightlights, which attract insects
  • Annual vaccination just before peak insect hatch (mid- to late summer to early fall)

Q.  Why is it important to reduce aquatic insect populations?
A.  Horses become infected with PHF after eating infected aquatic insects, so reducing the number of caddisflies, mayflies and other aquatic insects, especially during peak hatch, can reduce contamination of your horse's feed, bedding and water.

Drs Foster and Smith Articles

Vaccination Schedule for Horses
Vaccinate your horse against all diseases he may be exposed to, including at home or if you travel with your horse. This chart is a guideline of the vaccines suggested for some general ages and classes of horses.
Common Infectious Horse Diseases
Infectious diseases are those diseases that horses can get from each other, or via a vector, such as a mosquito, which may transmit the disease from horse to horse. Horse owners can vaccinate their horses against many of these diseases.
Equine Encephalomyelitis
Equine Encephalomyelitis is a disease that affects the nervous system. This disease is caused by at least three different types of equine encephalomyelitis viruses (Eastern, Western, and Venezuelan), which are carried by mosquitoes.
When to Call Your Horse's Vet
Horses sometimes require emergency equine first aid. This article discusses illnesses, injuries, and wounds that require immediate veterinary care from an equine veterinarian.
See All Articles

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