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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.


April 26, 2018
Equine Herpes Viruses
Laramie County, WY
Confirmed case(s): Official Quarantine
Source: Wyoming Livestock Board

On April 12, 2018 the Wyoming Livestock Board barrel racing horse in Laramie County suspected of having rabies was admitted to CSU Veterinary hospital with progressive neurologic disease effecting both hind and front limbs as well as the cranial nerves. The horse was recumbent and euthanized for humane reasons. Testing for rabies was negative on the 4/13/2018h. The horse owner was contacted and because EHM had not yet been ruled in or out, they were advised to impose a self-quarantine and implement enhanced monitoring of each horse on the premises to include at least twice daily recording of rectal temperatures with any suspect cases reported immediately. On Monday 4/23/2018, CSU reported to the WLSB that brain tissue was suspect on PCR for EHV-1 wild type and that histopathology of the spinal cord was consistent with EHM.   On Tuesday 4/24/2018, CSU reported to the WLSB that nasal swabs that had been collected on admission and held were test positive on PCR for EHV-1 wild type. This confirmed EHM and allowed an official quarantine to be placed on the premises which had already been meeting the conditions of such on a voluntary basis since the 4/12/2018. With no further cases being suspected during the 14 days from last exposure and diligent monitoring, the quarantine was released on 4/26/2018. The WLSB has been working closely with the Colorado Department of  Agriculture on this and other cases and the source of this infection is currently unknown.

April 25, 2018
Eastern Equine Encephalitis
Levy County, FL
Confirmed Case(s): No Quarantine
Source: Florida Department of Agriculture and Consumer Affairs

On April 25th, 2018 the Florida Department of Agriculture and Consumer Services received confirmation of one horse in Levy County who tested positive for Eastern Equine Encephalitis (EEE). The two-year-old mini mule became clinical on April 17 and was humanely euthanized on April 18 due to a poor prognosis. There is no known vaccination history.

April 25, 2018
Strangles
Ionia County, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

The Michigan Department of Agriculture and Rural Development has confirmed strangles in a nine-year-old Quarter Horse mare from Ionia County. The mare developed nasal discharge, fever, and a cough and is recovering under the care of a veterinarian. No quarantines were issued. This case brings the total number of confirmed strangles cases in Michigan for 2018 to three.

April 24, 2018
Equine Herpes Viruses
Bowman County, ND
Confirmed case(s): Official Quarantine
Source: North Dakota Department of Agruculture

The North Dakota Department of Agriculture has confirmed Equine herpesvirus myeloencephalopathy (EHM) in a Bowman County barrel-racing horse. The horse became notably ill on Thursday, April 19th . The disease rapidly progressed, resulting in euthanization that same day. Confirmatory lab results were received on April 20th. Horses that were exposed to the positive horse within 72 hours prior to the onset of clinical illness have been quarantined. Owners of other horses that may have had contact with the affected horse prior to that period are being advised to consult with their local veterinarian, monitor their horses and restrict travel. For more information go to https://www.nd.gov/ndda/news/ehm-confirmed-bowman-county-horse 

April 24, 2018
Equine Herpes Viruses
Orange County, CA
Outbreak Update
Source: California Department of Food and Agriculture

The California Department of Food and Agriculture has confirmed three additional EHV-1 positive horses at the quarantined facility in Orange County. Two horses displaying fevers over the weekend were confirmed positive on April 23rd and moved to isolation. An additional horse which had originally tested negative for EHV-1 after developing a fever was sampled a second time, was confirmed positive on April 24th, and was also moved into isolation. This brings the total of confirmed EHV-1 febrile cases to five and one confirmed case of EHM. Enhanced biosecurity measures and twice daily temperature recording for all exposed horses in the quarantine barn continues. CDFA staff continues to be onsite monitoring the situation.

April 20, 2018
Equine Herpes Viruses
Orange County, CA
Outbreak Update
Source: California Department of Food and Agriculture.

The California Department of Food and Agriculture confirmed two new cases of EHV-1 in the previously quarantined barn in Orange County on April 18th, 2018. A mare displayed a fever the morning of April 17,2018 and a horse which was febrile for one day on Sunday, April 8th. Both horses have been placed in separate quarantine isolation stabling on the property. An additional horse displaying a fever on April 18, 2019 tested negative for Equine Herpesvirus-1. The horse will be retested to confirm negative status. Exposed horses under quarantine continue to be monitored with twice daily temperature recordings. CDFA staff continues to be onsite to monitor the situation. For more information go tohttps://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html

April 20, 2018
Equine Herpes Viruses
Cherokee County, GA
Confirmed case(s): Official Quarantine
Source: Georgia Department of Agriculture

On April 17, 2018, the Georgia Department of Agriculture (GDA) confirmed EHV-1 in a miniature mule exhibiting respiratory signs in Cherokee County. GDA has placed the facility under quarantine. The mule died due to complications related to pneumonia. Other equids that may have come into contact with the affected mule are being monitored and are currently not showing clinical signs of the disease.

April 20, 2018
Equine Herpes Viruses
Weld County, CO
Confirmed case(s): Official Quarantine
Source: Colorado State Veterinarian’s Office

On April 18, 2018, the Colorado State Veterinarian’s Office confirmed Equine Herpesvirus Myeloencephalopathy (EHM) in a horse exhibiting neurological clinical signs in Weld County. The Colorado Department of Agriculture has placed the facility under quarantine, and facility management has voluntarily suspended all activities at the premises. The horse is undergoing treatment and is recovering. Other horses that may have come into contact with the affected horse are being monitored and are currently not showing clinical signs of the disease.

April 19, 2018
Equine Herpes Viruses
Washtenaw County, MI
Outbreak Update
Source: Michigan Department of Agriculture and Rural Development

On March 27, the Michigan Department of Agriculture and Rural Development confirmed its first case of equine herpesvirus myeloencephalopathy (EHM) for 2018 in a five-year-old Standardbred gelding from Washtenaw County. The horse was immediately quarantined off-site and 16 horses other horses were quarantined where the horse had originated. The 16 horses were monitored twice a day for fevers and sign of herpesvirus, starting the day the EHM positive horse was removed from the premises. As of April 17, the other 16 horses have had 21 consecutive days without the presence of fevers or clinical signs and have been released from quarantine. The EHM positive horse is currently recovering and being quarantined at a separate premises where there are no equine within 30 feet of the property.

April 18, 2018
Equine Herpes Viruses
Kennett Square, PA
Quarantine Released
Source: Pennsylvania Department of Agriculture

 

On April 17, 2018, the Pennsylvania Department of Agriculture Bureau of Animal Health and Diagnostic Services revoked the quarantine related to an EHM case at a boarding stable in Kennett Square, Chester County, PA.