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New test determines exposure to strangles in horses
2637_horse_small.jpg Picture: © Bayer Animal Health
A new ELISA test to determine a horse`s level of exposure to strangles is under development at Colorado State University`s (CSU) veterinary teaching hospital. It would give veterinarians a tool to efficiently assess the horse`s risk level by evaluating the animal`s blood antibody titers.

Strangles is a highly infectious disease in horses that affects the upper respiratory tract and the lymph nodes surrounding the throat, causing swelling and abscessation.

`What we hope to achieve with this test is the ability to definitively determine a horse`s risk level so that the owner can more quickly make informed health-related management decisions,` explains Dr. Ann Davidson, one of the equine veterinarians creating the test.

The basis of this ELISA method, developed specifically for Streptococcus equi, relies on whether there are antibodies to the bacteria in the blood. If an animal has been exposed, the test would detect those antibodies and would reflect a high titer.

`One of the challenges in diagnosing strangles lies with horses that are not exhibiting signs of active illness, but are carriers shedding the bacteria. It is often through contact with these shedders that other horses can become infected.`

Currently, tests exist only for horses with active signs of disease. The `gold standard` is a laboratory culture of the nasal discharge or abscess material. Another method is a polymerase chain reaction test, or PCR test.

`The advantage to the ELISA test on the horse`s serum is that we can now determine those horses who may not have been exposed and are at risk,` says Dr. Josie Traub-Dargatz of CSU, another of the test`s researchers.

`Once perfected, we hope the test results will be rapid and readily available, making it a very useful tool for equine veterinarians.`


Source: www.dvmnewsmagazine.com
Foto: http://www.nrce.nic.in/photos/strangles.jpg
Indian Council of Agricultural Research



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