Potomac Horse Fever.

This research focuses on Potomac Horse Fever (PHF), a common cause of horse colitis. The study notes previously only one cause of PHF was known, Neorickettsia risticii, but a new causative agent, N. findlayensis, has been found as well. It also discusses the symptoms, diagnostic methods, treatment, and supportive care for PHF.

Overview of Potomac Horse Fever

• The research article primarily focuses on Potomac Horse Fever (PHF), a disease often cause of colitis in horses found in endemic areas. This is a gastrointestinal illness that results in inflammation of the colon.
• Previously, Neorickettsia risticii was known as the only causative agent of PHF. However, recent studies have identified another causative organism, Neorickettsia findlayensis. Both are bacteria that are typically ingested by horses through trematodes (type of parasite) present in aquatic insects.

Symptoms of Potomac Horse Fever

• The common clinical symptoms exhibited by horses with PHF are fever, diarrhea, anorexia, lethargy, and colic. These symptoms are usually quite severe and can greatly affect the health and performance of the infected horses.

Diagnosis of Potomac Horse Fever

• Diagnosis of PHF is primarily carried out using a Polymerase Chain Reaction (PCR) test. This test is typically conducted on the blood and feces of the horse to detect the presence of the bacteria causing PHF. The PCR test is widely considered as the most accurate and reliable method for diagnosing this disease.

Treatment for Potomac Horse Fever

• Tetracyclines, a class of antibiotics, are often used to treat PHF effectively. They inhibit the growth of bacteria, thus helping to control and eventually eradicate the disease from the horse’s system.
• In addition to antibiotics, supportive care is also necessary for some cases. This can include fluid therapy to prevent dehydration due to diarrhea, colloid administration to maintain plasma volume, Nonsteroidal anti-inflammatory drugs (NSAID), anti-endotoxin medication to neutralize toxins produced by bacteria, and digital cryotherapy (treatment using cold) for the horse’s extremities.