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Disease 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.



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Montgomery County, MD
Alert ID: 1054
September 22, 2018

Maryland Department of Agriculture

  1. September 21, 2018, the Maryland Department of Agriculture, Animal Health Program confirmed a positive Equine Herpesvirus Myeloencephalopathy (EHM) in a 12-year old warmblood gelding in a Maryland horse. The neurological horse was seen earlier and treated as an outpatient on September 21st at a private veterinary clinic Loudoun County, Virginia before returning home to a private farm in Montgomery County, Maryland. A hold order placed on the farm the evening of September 21st. There are 18 horses on the farm in three barns. The positive gelding is isolated from all horses on the farm. The positive gelding was previously housed with 4 horses in one barn. The other two barns are more than 30 feet away from the exposed barn. Strict isolation and biosecurity protocols are in place at the exposed barn with body temperatures taken twice daily. With all three barns there will be no movement on or off the farm. The other two barns will be observed daily and adhering to strict biosecurity procedures. The attending veterinarians that administers to this farm will be notified of the hold order and apprised of the procedures taken to control the spread of EHV-1/EHM. Possible links to the positive gelding are actively being investigated.