Potomac Horse Fever (PHF) is a non-contagious, infectious equine disease caused by the rickettsial organism Neorickettsia risticii (previously known as Ehrlichia risticii). The disease can affect any age, breed or sex of horse. PHF cases usually occur in summer and fall, but may occur in any season depending on weather conditions.
Risk factors for PHF include housing near (within approximately 5 miles) a freshwater stream or river or on irrigated pasture in endemic areas; and nighttime use of barn lights which attract parasitized insects.
Related Resources
Template: Fillable Pre-Purchase Form
Fillable Pre-Purchase Examination (PPE) template developed by the AAEP Performance Horse Committee
AAEP Position on Therapeutic Medication for the Competition Horse
The AAEP policy on medication in the competition horse is driven by…
Rhodococcus equi Disease Guidelines
Rhodococcus equi (R. equi) remains the most common cause of subacute or…
