The Causes of Potomac Horse Fever Horses pick up the disease by grazing near freshwater creeks, rivers or even on irrigated pastures. When they ingest the insects carrying PHF, they also pick up the bacteria. Additionally, horses can also become infected by drinking water that contains free-living flatworms.
What is the agent that causes Potomac horse fever?
Potomac horse fever (PHF) is an acute systemic and potentially fatal disease of horses, which is also known as equine monocytic ehrlichiosis. It is caused by Neorickettsia risticii, an obligate intracellular endosymbiotic bacterium of digeneans (Platyhelminthes, Digenea) that parasitize snails and insects1,2.
What is the most common cause of death in horses with Potomac horse fever?
Laminitis (20% to 30% of horses with PHF get laminitis) Toxemia. Death (20% to 25% of horses with PHF die)
Is Potomac horse fever contagious?
Potomac Horse Fever is not contagious. If more than one horse at the same location contracts the disease, it is because of the environmental conditions that draw the vectors. The disease causes colitis, dehydration and diarrhea.Should I vaccinate for Potomac horse fever?
A vaccine for Potomac Horse Fever is available. The vaccine does not prevent the disease but can reduce its severity. Horses should be vaccinated prior to the peak seasons of exposure. The clinical signs of Potomac Horse Fever are similar to those of many infectious diseases.
Is there a cure for Potomac horse fever?
Antibiotic therapy with oxytetracycline is the most common treatment and is usually started as soon as Potomac horse fever is suspected. Other treatments that may be necessary include anti-inflammatory medications such as Banamine®, IV fluids, electrolytes, and specific laminitis treatment/prevention.
What is the incubation period for Potomac horse fever?
Because the incubation period is 10-18 days, acutely ill animals often have an elevated PHF IFA titer. Vaccinated animals may have a titer in a similar range. Paired acute and convalescent titers will help sort out response to infection versus a vaccine or previous exposure.
Where do we see Potomac horse fever?
PHF has been reported from most states in the United States, five provinces in Canada, South America (Brazil, Uruguay), Europe (France, The Netherlands), and India. Horses of all breeds and ages may be affected, but PHF is not common in younger horses (<1 year).Is Potomac horse fever treatable?
PHF is treatable with supportive care but severe cases carry a poor prognosis. Quick recognition and action is important! The transmission of PHF is complex. Horses ingest mayflies and/or caddisflies, which are infected with the rickettsial organism.
What does strangles do to horses?Strangles is a highly contagious disease of the equine upper respiratory tract caused by the bacterium Streptococcus equi subspecies equi (S. equi). The bacteria cross mucous membranes in the nose and mouth to infect lymph nodes where they cause abscesses that can eventually rupture.
Article first time published onWhat can you give a horse for a fever?
“The first thing we’d use to treat a fever is a nonsteroidal anti-inflammatory drug [NSAID] like flunixin meglumine [Banamine] or phenylbutazone [bute],” says Nolen-Walston. “These will often bring down a fever.” These drugs do have to be administered with care, as directed, however.
What is laminitis?
Laminitis is a common, extremely painful and frequently recurrent condition in horses, ponies and donkeys. It has significant welfare implications for owners. This condition affects the tissues (laminae) bonding the hoof wall to pedal bone in the hoof.
What is another name for Potomac horse fever?
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.
Can a horse get Potomac horse fever twice?
PHF is not contagious nor does it pass between horses via casual contact. When multiple cases appear together on the same farm, it means that more than one horse consumed infected insects. The most common signs of PHF are fever accompanied by loss of appetite and lethargy.
What system does Potomac horse fever affect?
Potomac horse fever (PHF) is an acute enterocolitis syndrome producing mild colic, fever, and diarrhea in horses of all ages, as well as abortion in pregnant mares. The causative agent is Neorickettsia risticii.
How often is Potomac horse fever vaccine?
Usually the vaccine is given once or twice a year, based on individual risk (if once a year, usually in the spring so that antibody levels are highest throughout the summer, when the risk is greater). For horses at very high risk of infection, it can be administered up to 4 times a year.
What does Streptococcus equi cause?
Streptococcus equi causes the disease known as “strangles” in horses. It affects primarily younger horses but may affect older horses that are immunologically naive. S. equi infection is transmitted by direct contact or via fomites such as water troughs, feed bunks, pastures, and stalls.
How do you treat pigeon fever in horses?
Treatment of Pigeon Fever in Horses Penicillin and an anti-inflammatory will typically be administered to the horse. There is currently no vaccine for pigeon fever.
Is colitis contagious in horses?
Take care to follow appropriate isolation procedures if your horse has infectious colitis, as the contagious bacteria, or virus, can transfer from horse to horse, and even sometimes from horse to human (i.e. Salmonella).
Can dogs get Potomac horse fever?
The bacterium has also been isolated in cats, dogs, goats, pigs and mice, although in these species, the disease is subclinical. Potomac fever has a seasonal character, ocurring mainly in summer and early autumn, together with the greater proliferation of potential vectors.
Is Potomac horse fever in Canada?
Potomac Horse Fever (PHF) is a seasonal disease, occurring between late spring and early fall in temperate regions of Canada and the United States.
What causes high fever in horses?
It’s always best to call a veterinarian when a horse has a high fever. A horse with a fever of 105 or higher may have strangles, Potomac Horse Fever, equine influenza or another infections; viral infections tend to produce higher fevers that bacterial infections. Endotoxemia may be another cause of fever.
What are the symptoms of Lyme disease in horses?
Not all infected horses develop clinical signs of Lyme disease. If clinical signs occur, they can include chronic weight loss, sporadic lameness, shifting leg lameness, low-grade fever, muscle tenderness, chronically poor performance, swollen joints, arthritis and diverse orthopedic problems2-5.
Is there a vaccine for strangles in horses?
To help protect horses against strangles, look to PINNACLE ® I.N. — the only modified-live bacterial vaccine developed to help prevent strangles caused by Streptococcus equi (S. equi). Strangles is a highly contagious upper-respiratory infection most common in young horses.
Can humans catch strangles?
Transmission to Humans. In rare cases, humans have contracted infections from the bacteria that cause Strangles. To prevent human infection, people caring for horses with Strangles should avoid getting any nasal or abscess discharge from the horse on their eyes, nose, or mouth.
What are the first signs of strangles in horses?
- Depression.
- Loss of appetite/ Difficulty eating.
- Raised temperature.
- Cough.
- Nasal discharge, often thick and yellow (purulent or pus like).
- Swollen lymph nodes (glands) around the throat.
- Drainage of pus from the lymph nodes around the jaw.
How can strangles be transmitted?
Strangles is a disease caused by a bacteria called Streptococcus equi that can be easily spread directly through horse to horse contact and indirectly through contaminated equipment, handler clothing and boots etc.
Does Bute help with fever in horses?
NonSteroidal Anti-Inflammatory Drugs (NSAIDs) such as phenylbutazone (Bute), flunixin meglumine (Banamine) and firocoxib (Equioxx) are commonly used in equine patients to help relieve pain, decrease inflammation, and control fever.
What does banamine do for a horse?
Banamine is a nonsteroidal anti-inflammatory agent that relieves pain, swelling and fever in horses. Banamine comes in two forms: injectable and oral. Veterinarians routinely use the injectable form in the vein (IV). Horse owners may have oral and injectable banamine on hand to relieve pain.
How quickly does banamine work?
Dose and Administration Studies show onset of activity is within 2 hours. Peak response occurs between 12 and 16 hours and duration of activity is 24-36 hours. The recommended dose for the alleviation of pain associated with equine colic is 0.5 mg per pound of body weight.
What caused secretariat laminitis?
As laminitis is a major life-threatening disease in horses, Dr. Swerczek’s research focused on nitrate toxicity as a suspected cause of laminitis, a suspected cause of the very laminitis that affected Secretariat, causing his premature death.
