Officials say it's similar to West Nile, and both are transmitted by the same type of mosquitoes.
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Five other cases are under investigation as potential encephalitis or West Nile Virus infections.
Health officials say people infected with encephalitis may show flu-like symptoms, such as a fever or headache, or no symptoms at all.
Severe cases can affect the central nervous system.
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Officials want to remind you to drain standing water that could attract breeding mosquitoes.
Use insect repellent and wear long sleeves and pants to avoid getting bitten.