Summary of outcomes of each treatment group analyzed by CNS microarray.

aModerate or severe signs in at least one of the following categories for at least two days: mentation, paresis, fasciculation, or ataxia.bBody temperature ≥39.2°C (102.5°F).cDeath due to development of WNV disease severe enough to require euthanasia for humane reasons.dEncephalitic horses in the control group had moderate or severe encephalitis on histopathology.eMild inflammatory histopathologic changes in neural tissues vaccinated horses.