Kentucky’s PHF Cases Through July 24, 2018

Eighteen cases of Potomac horse fever (PHF) have been reported thus far this year in Kentucky.

The Kentucky State Veterinarian’s office has reported 18 cases of PHV this year. undefined

The first confirmed case of Potomac horse fever (PHF) diagnosed in Kentucky during calendar year 2018 was reported on June 1, 2018. The diagnosis was confirmed by PCR testing and compatible clinical symptoms observed.

Historically, Kentucky’s PHF cases are first detected later in the year (mid-July), and our thought is the early detection this year was most probably associated with abundant wet weather in April and record-breaking warm temperatures in May.

Horse owners are encouraged to review the environment in which their horses are housed and consult with their veterinarians on strategies they can use to mitigate disease risk. Minimizing opportunity for horses to ingest aquatic insects by turning off lights in and around barns and other areas at night has been suggested.

Potomac horse fever is described to be an acute enterocolitis syndrome that presents as mild colic, fever and diarrhea in horses of all ages. The resulting illness can also cause abortion in pregnant mares. The causative agent, Neorickettsia risticii, is a gram-negative bacterium. 

Infection of the large intestine results in an acute colitis, which is one of the principal clinical signs of PHF. While the disease is often associated with pastures bordering creeks or rivers, it is believed most horses contract PHF after inadvertent ingestion of aquatic insects that carry N risticii and not from the water source.

This breakdown of the 18 horses confirmed with Potomac horse fever in Kentucky thus far this year is courtesy of the Kentucky State Veterinarian’s office. undefined
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