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====Description====
====Description====
Viraemia. CNS replication within a week
Viraemia during the acute phase of EEE and WEE. Incubation period of 1-3weeks after experimental infection with EEE or WEE. Incubtion often shorter with EEE. CNS replication within a week
====Epidemiology====
====Epidemiology====
Transfer via '''vector''': mostly through '''[[Culicidae|mosquito salivary transfer]]'''
Transfer via '''vector''': mostly through '''[[Culicidae|mosquito salivary transfer]]'''
Disease amplification occurs during the viraemic phase which lasts until nervous signs develop.
====Signalment====
====Signalment====
====Clinical Signs====
====Clinical Signs====
Worse in unvaccinated animals. Acute signs of EEE and WEE are nonspecific, last up to 5 days and include:
*mild to severe pyrexia
*anorexia
*stiffness
Early signs transient and often missed:
*pyrexia
*mild depression
Disease progression occurs more frequently with EEE than WEE:
*fever may rise and fall sporadically
Cerebral signs often occur a few days post-infection (but can occur at any time. In the acute phase the following may be noted:
*propulsive walking
*depression
*somnolence
*hyperaesthesia
*agression
*excitability
*frenzy in response to sensory stimulation
*conscious proprioceptive deficits
*Paralysis of the lips
*Paralysis of the lips
*Drooping eyelids
*Drooping eyelids