WEE is caused by the western equine encephalitis virus, which is one of a group of viruses called arboviruses. In the United States, these viruses are usually spread by infected mosquitoes.
Risk Factors
A risk factor is something that increases your chance of getting a disease or condition. Some factors thought to increase the risk of WEE include:
Living in or visiting the plains regions of the western and central United States
Working outdoors
Participating in outdoor activities
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