Changes

Worse in unvaccinated horses.   

Worse in unvaccinated horses.   

=====EEE and WEE=====

=====(1) EEE and WEE=====

Following an incubation period of 7-21days, an initial pyrexia and mild depression are short-lived and often missed.  The acute phase of the disease presents with mild to severe pyrexia, anorexia and stiffness, lasting up to 5 days.  During this time, the horse is viraemic and capable of amplifying the disease.  The fever may then fluctuate with neurological derangements appearing a few days post-infection.  These changes indicate disease progression, which occurs more frequently with EEE (the most virulent of the three serotypes).  Any of the following may be observed:

Following an incubation period of 7-21days, an initial pyrexia and mild depression are short-lived and often missed.  The acute phase of the disease presents with mild to severe pyrexia, anorexia and stiffness, lasting up to 5 days.  During this time, the horse is viraemic and capable of amplifying the disease.  The fever may then fluctuate with neurological derangements appearing a few days post-infection.  These changes indicate disease progression, which occurs more frequently with EEE (the most virulent of the three serotypes).  Any of the following may be observed:

*conscious proprioceptive deficits

*conscious proprioceptive deficits

*recumbency for 1-7 days followed by death

*recumbency for 1-7 days followed by death

=====VEE=====

=====(2) VEE=====

Clinical signs may resemble those of WEE and EEE or may vary:

Clinical signs may resemble those of WEE and EEE or may vary:

*pyrexia peaks early and persists throughout the disease course

*pyrexia peaks early and persists throughout the disease course