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Disease Outbreak Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.


Date Disease Location Status
September 20, 2016 Eastern Equine Encephalitis Clare and Menominee Counties, MI Confirmed Case(s): No Quarantine
As of September 20, the Michigan Department of Agriculture and Rural Development (MDARD) has identified two cases of Eastern equine encephalitis (EEE). On September 15, 2016, the Michigan Department of Agriculture and Rural Development was notified that a four month old Standardbred filly in Clare County tested positive for Eastern Equine Encephalitis (EEE). The filly had developed a sudden fever, was staggering and eventually unable to rise. The filly was not vaccinated against EEE and did die. On September 16, Michigan's second case of EEE was identified in a 12-year-old, Quarter Horse mare in Menominee County. The horse had a fever, was not eating or drinking, and was leaning against walls. The unvaccinated mare later died.For more information visit www.michigan.gov/equinediseases.
September 20, 2016 Eastern Equine Encephalitis Sumter County, FL Confirmed Case(s): No Quarantine
On September 19, a new EEE case was confirmed in Sumter County, Florida. The 11 year old Quarter Horse mare was last vaccinated for EEE in late Summer 2015 per the owner and had no recent travel history. Clinical signs began on August 13 and the horse was euthanized for humane reasons later the same day. This is the first confirmed EEE case in Sumter County and case 20 in Florida for 2016.
September 19, 2016 West Nile Virus Stevens, Spokane, Grant, Kittitas, Franklin, Pend Oreille, and Okanagon Counties, WA Confirmed Case(s): No Quarantine
The Washington State Department of Agriculture has documented nine confirmed cases of West Nile Virus so far in September. None of the horses were vaccinated. - A 7 year old QH mare in Stevens County was confirmed positive on 9/1; prognosis is good. - A cross breed gelding in Spokane County was confirmed positive on 9/3; prognosis is good. - A 12 month old QH cross filly in Stevens County was confirmed positive on 9/4 and has passed away. - A 2 year old Arabian colt in Grant County was confirmed positive on 9/6; prognosis is good. - A 17 year old gelding in Kittitas County was confirmed positive on 9/7; prognosis is good. - A 13 year old Paint gelding in Franklin County was confirmed positive on 9/12; euthanized. - A 6 year old QH mare in Pend Oreille County was confirmed positive on 9/11; prognosis is fair. - A 23 year old Arab cross mare in Okanogan County was confirmed positive on 9/11 and was euthanized. - A 5 year old Arab cross mare in Spokane County was confirmed positive on 9/13; prognosis is good.
September 19, 2016 Eastern Equine Encephalitis Vilas County, WI Confirmed Case(s): No Quarantine
An unvaccinated, 12-year-old, Quarter Horse mare seen on 9/7/16 in Vilas County, was fourth confirmed equine case of EEE in Wisconsin in 2016. The mare was febrile, unable to rise, and unresponsive with various neurologic signs including extensor rigidity, struggling, nystagmus, intermittent tonic-clonic activity and frequent tooth grinding. The attending veterinarian humanely euthanized the mare.
September 19, 2016 Strangles Hillsborough County, FL Confirmed case(s): Quarantine
On September 19, one premise in Hillsborough County, Florida was placed under quarantine for strangles. The horse began showing respiratory signs in September 7 after being imported from a Louisiana Kill Facility and as was isolated. A respiratory panel taken returned positive for strangles and EHV 4. The one horse is the only equine on the premises and no animals have left the facility since clinical signs began. This is the second case in Hillsborough County and case 20 for Florida in 2016
September 19, 2016 West Nile Virus Tuscarawas County, OH Confirmed Case(s): No Quarantine
Testing on samples taken from a seven-year-old Standardbred in Tuscarawas County confirmed the positive WNV diagnosis to the Ohio Department of Agriculture Sept. 12. The horse’s veterinarian first examined the animal Aug. 29. The animal was euthanized after exhibiting significant clinical signs, including shaking, agitation and thrashing. The horse had not been vaccinated. For more information got to http://www.agri.ohio.gov/public_docs/news/2016/09.16.16%20Animal%20Health%20Alert%20-%20Ohio%20West%20Nile%20Virus%20Horse.pdf
September 16, 2016 West Nile Virus Clark County, WI Confirmed Case(s): No Quarantine
An unvaccinated Belgian filly in Clark County, Wisconsin was confirmed as the 6th West Nile Virus case in 2016. The filly had trouble standing on Sept 10th and was tested and treated on that day. At last report the filly was recovering. Four to the six confirmed WNV cases have been in Clark County.
September 15, 2016 West Nile Virus Toronto, ON Confirmed Case(s): No Quarantine
On September 12, the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a positive test result for West Nile Virus (WNV) in a horse from the Toronto area. The horse displayed signs of fever, muscle tremors, gait abnormalities (ataxia) and weakness. The horse’s vaccination history is unknown; the horse is recovering under veterinary medical supervision.
September 13, 2016 West Nile Virus Marshall County, MN Confirmed Case(s): No Quarantine
The Minnesota Board of Animal Health has confirmed West Nile Virus infection in a 2-year old Quarter Horse gelding in Newfolden (Marshall County). The horse which had neurologic symptoms was not vaccinated but is recovering.
September 13, 2016 Eastern Equine Encephalitis Waupaca County, WI Confirmed Case(s): No Quarantine
Wisconsin has confirmed another positive equine case of EEE. The middle-aged unvaccinated Haflinger gelding from Waupaca County was found down with neurologic signs on September 6th and tested. He did not respond to treatment and was euthanized on September 7th. That is the third confirmed equine case in WI this year.