Difference between revisions of "Equine Arteritis Virus"

From WikiVet English
Jump to navigation Jump to search
(New page: {{unfinished}} {{toplink |linkpage =Viruses |linktext =VIRUSES |sublink1=Arteriviridae |subtext1=ARTERIVIRIDAE |pagetype =Bugs }} <br> ====Antigenicity==== *Most cases are subclinical an...)
 
Line 1: Line 1:
 
{{unfinished}}
 
{{unfinished}}
 
{{toplink
 
|linkpage =Viruses
 
|linktext =VIRUSES
 
|sublink1=Arteriviridae
 
|subtext1=ARTERIVIRIDAE
 
|pagetype =Bugs
 
}}
 
<br>
 
  
 
====Antigenicity====
 
====Antigenicity====
Line 55: Line 46:
 
*Mares tested within 4 weeks of mating
 
*Mares tested within 4 weeks of mating
 
*In an outbreak, isolate and restrict movement until antibody-negative for one month
 
*In an outbreak, isolate and restrict movement until antibody-negative for one month
 +
[[Category:Arteriviridae]][[Category:Horse]]

Revision as of 17:51, 18 May 2010



Antigenicity

  • Most cases are subclinical and only antibody positive

Hosts

  • More common in thoroughbreds

Pathogenesis

  • Infects nasopharynx and spreads locally, causing:
    • Dypsnoea
    • Coughing
    • Diarrhoea
    • Colic
  • Spread to lymphoid tissue leads to leukopenia and immunosuppression
  • Typical medial necrosis of arteries causing:
    • Hemorrhage
    • Abortions occur after 10-30 days in 50% of pregnant mares (as opposed to Equine Herpes, which shows late abortions)
    • Oedema - particularly ocular, giving rise to "pink eye"
  • Other clinical signs include:
    • Pyrexia
    • Nettle rashes
    • Ocular and nasal discharge
    • Swelling of legs or scrotum
    • Stiffness of gait
  • Foal death caused by interstitial pneumonia
  • Stallions become intermittent or persistent shedders from accessory sex glands but may show no clinical signs


Epidemiology

  • Controlled virus in the UK but AI and breeding schemes presents a real risk

Diagnosis

  • Clinical symptoms, but may be variable
  • PCR on semen
  • ELISA for serum antibody

Control

  • Vaccines:
    • Stallions: Live attenuated
    • Mares: Killed whole virus
  • Clinical disease is NOTIFIABLE
    • Seropositive stallions restricted from teasing, mating or AI unless PCR tested negative
    • Persistent shedders should be castrated
  • Serology on imported horses
  • Mares tested within 4 weeks of mating
  • In an outbreak, isolate and restrict movement until antibody-negative for one month