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Potomac Horse Fever (PHF) is a potentially-fatal febrile illness affecting horses caused by the intracellular bacterium Neorickettsia risticii. PHF is also known as Shasta River Crud and Equine Monocytic Ehrlichiosis .
N. risticii is the known causative agent of equine neorickettsiosis (also known as Potomac horse fever or PHF), [2] which gets its name from its discovery near the Potomac River in Maryland and Virginia. [3] N. risticii was first recovered from horses in this region in 1984 but was not recognized as the causative agent of PHF until 1979. [3]
Chronic: The horse tires easily and is unsuitable for work. The horse may have a recurrent fever and anemia, and may relapse to the subacute or acute form even several years after the original attack. [citation needed] A horse may also not appear to have any symptoms, yet still tests positive for EIA antibodies.
Horses generally present with signs of colic before developing profuse, watery, fetid diarrhea. Both infectious and non-infectious causes for colitis exist. In the adult horse, Salmonella, Clostridioides difficile, and Neorickettsia risticii (the causative agent of Potomac Horse Fever) are common causes of colitis.
Equine encephalosis virus; Equine exertional rhabdomyolysis; Equine gastric ulcer syndrome; Equid alphaherpesvirus 1; Equid alphaherpesvirus 3; Equine infectious anemia; Equine influenza; Equine melanoma; Equine multinodular pulmonary fibrosis; Equine polysaccharide storage myopathy; Equine protozoal myeloencephalitis; Equine proximal enteritis ...
Many additional vaccines may be needed, depending on local conditions and risk, including Rhodococcus equi (strangles), Botulism, or Potomac Horse Fever. [10] As a general rule, a horse or pony that has never had a particular vaccination will be given an initial vaccination and then a booster a few weeks later, then normally once a year after that.
Equine influenza is characterized by a very high rate of transmission among horses, and has a relatively short incubation time of one to three days. [6] Clinical signs of equine influenza include fever (up to 106 °F [41 °C]), nasal discharge, have a dry, hacking cough, depression, loss of appetite and weakness. [6]
Colitis X, equine colitis X or peracute toxemic colitis is a catchall term for various fatal forms of acute or peracute colitis found in horses, but particularly a fulminant colitis where clinical signs include sudden onset of severe diarrhea, abdominal pain, shock, and dehydration. Death is common, with 90–100% mortality, usually in less ...