PHILADELPHIA (WPVI) -- A teenager in Florida is the first human to be diagnosed with Keystone virus.
Like West Nile and Zika, it's spread by mosquitoes.
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Experts thought it could only be spread to animals but this is the first human case.
It sparked a fever and severe rash. To prevent mosquito bites, try to cover-up with clothing, use repellent and get rid of standing water.
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