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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.

Alert ID: 1265
May 23, 2019
Chester County, PA
Outbreak Update
Source: Pennsylvania Department of Agriculture

The Chester County, PA horse that tested positive for EHV-1 died on May 17 in isolation on a private farm. The post-mortem results indicate that the horse died of an unrelated medical issue, not from equine herpes myeloencephalopathy (EHM, the disease caused when EHV affects the central nervous system). There have been no other horses showing signs of EHV-1 infection and there is no “outbreak” as has been reported elsewhere. The horse had been placed in isolation at its home farm on May 15 when it began to show signs of illness, including abnormal gait and stance and a high fever. As EHV-1 was detected in the horse’s nasal swab sample, all horses at the Chester County farm were quarantined. Based on the post-mortem findings, the low levels of EHV detected on the nasal swab sample, and the absence of EHV-related illness in any of the horses on the premises, there appears to be little risk even for the horses that were in direct contact with the horse that died. Furthermore, the two horses that had moved off the farm prior to the horse getting sick pose an even lower risk of spreading EHV-1. These two horses have returned to the home farm, also remain under close monitoring and have shown no signs of illness. Following national guidelines, and in consultation with EHV regulatory experts, the horses on the home premises will remain under quarantine with monitoring for a minimum of 14 days from when the affected horse was isolated (beginning May 15). No quarantined horses have shown any signs of illness to date. EHV-1 causes illness in some horses and others may carry virus without showing clinical disease. In particular, horses that are under stress may be more likely to shed the virus.  For more information about EHV-1 go to    https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHV.pdf

Alert ID: 1264
May 22, 2019
King County, WA
Confirmed Case(s): Voluntary Quarantine
Source: Washington State Department of Agriculture

Number Confirmed: 1;
Number Exposed: 5;
Age: 11; Gender: Gelding; Breed: Belgian; Onset of Clinical Signs: 5/13/2019;
Clinical Signs: Fever, Nasal Discharge; Confirmation Date: 5/15/2019; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Alert ID: 1262
May 21, 2019
Snohomish County, WA
Confirmed Case(s): Voluntary Quarantine
Source: Washington Department of Agriculture

Number Confirmed: 2;
Number Exposed: 10;
Age: 4Gender: GeldingBreed: ArabianOnset of Clinical Signs: 5/11/2019;
Clinical Signs: Fever, Nasal Discharge, Swollen Lymph NodesConfirmation Date: 5/15/2019Horse Status: RecoveringVaccination Status: Undervaccinated;
 

Age: 4; Gender: Mare; Breed: Arabian; Onset of Clinical Signs: 5/11/2019;
Clinical Signs: Fever, Nasal Discharge, Swollen Lymph Nodes; Confirmation Date: 5/15/2019; Horse Status: Recovering; Vaccination Status: Undervaccinated;
 

Notes: Two confirmed cases have mild symptoms and the remaining 8 were exposed. None were vaccinated for Strangles

Alert ID: 1261
May 17, 2019
Chester County, PA
Confirmed case(s): Official Quarantine
Source: Pennsylvania Department of Agriculture

Number Confirmed: 1;
Number Exposed: Not Reported;
Clinical Signs: Neurologic Deficits;Horse Status: Affected And Alive; 
Notes: The horse remains on its home premises, a private equestrian facility in Chester County, Pennsylvania. The premises has been quarantined by the Pennsylvania Department of Agriculture, Bureau of Animal Health. The index case had not left the premises for over three weeks and was placed in strict isolation immediately when clinical signs were recognized. All horses on the premises are being monitored for clinical signs of EHV-1 infection and biosecurity precautions have been implemented to prevent the spread of the virus.

Alert ID: 1260
May 17, 2019
Shelby County, TN
Confirmed case(s): Official Quarantine
Source: Tennessee Department of Agriculture

Number Confirmed: 1;
Number Exposed: Not Reported;
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: Not Reported;
Clinical Signs: None; Confirmation Date: 5/16/2019; Horse Status: Euthanized; Vaccination Status: Status Unknown;
Notes: This horse was in Tennessee for only two days before the EIA sample was drawn. The horse was isolated in a barn by itself, so there is low risk of exposure to other horses.

Alert ID: 1259
May 16, 2019
Maricopa County, AZ
Outbreak Update
Source: Arizona Department of Agriculture

Number Confirmed: 4

Number Exposed: 13

Age: 12; Gender: Not Reported; Breed: Pony; Onset of Clinical Signs: 5/10/2019;
Clinical Signs: lethargy; Confirmation Date: 5/14/2019; Horse Status: Recovering; Vaccination Status: Vaccinated;

Age: 20; Gender: Not Reported; Breed: Quarter Horse (QH); Onset of Clinical Signs: 5/9/2019;
Clinical Signs: Ataxia, Muscle Fasciculations; Confirmation Date: 5/14/2019; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;
 

Age: Not Reported; Gender: Not Reported; Breed: Not Reported; Onset of Clinical Signs: 5/10/2019; Clinical Signs: Ataxia; Confirmation Date: 5/14/2019; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Notes: The Arizona Department of Agriculture has released an update on EHV-1 in Maricopa County. Three additional horses have been confirmed positive

 

Alert ID: 1258
May 14, 2019
Fayette County, GA
Quarantine Released
Source: Georgia Department of Agriculture

The Georgia Department of Agriculture’s (GDA) Animal Industry Division has updated information on the case of Equine Infectious Anemia (EIA) discovered in Fayette County in 2019. On April 18, 2019, the Department released the quarantine on one premise in Fayette County after follow up testing revealed no additional cases. There are no EIA-related quarantines in Georgia at this time. 

Alert ID: 1257
May 13, 2019
King County, WA
Confirmed Case(s): Voluntary Quarantine
Source: Washington State Department of Agriculture

Number Confirmed: 5; 18 suspected cases;
Number Exposed: 26;
Age: Not Reported; Gender: Not Reported; Breed: Not Reported; Onset of Clinical Signs: Not Reported;
Notes: Horses arrive on 30 April and symptoms started on 2 May. Confirm on 9 May. 18 head have signs of fever and/or abscesses. Owners stopped movement in and out and instigated biosecurity measures.;

Alert ID: 1256
May 11, 2019
Maricopa County, AZ
Confirmed case(s): Official Quarantine
Source: Arizona Department of Agriculture

Number Confirmed: 1;
Number Exposed: 2;
Age: 23; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: Not Reported;
Clinical Signs: Neurological Signs; Confirmation Date: 5/7/2019; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
Notes:  No travel history over the last 4 weeks. Quarantined to residence.

Alert ID: 1255
May 11, 2019
Maricopa County, AZ
Confirmed case(s): Official Quarantine
Source: Arizona Department of Agriculture

Number Confirmed: 1;
Number Exposed: 13;
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 5/7/2019;
Clinical Signs: Ataxia, Weakness; Confirmation Date: 5/7/2019; Horse Status: Recovering; Vaccination Status: Unvaccinated;
Notes: Acute onset of neurologic signs. No travel history.