Scientists first discovered the Keystone virus in the Keystone area of Tampa 50 years ago.
The first known human case of the disease was just identified in North Florida, but it took doctors a year to make the diagnosis.
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Doctors say there were likely other undiagnosed cases before this one.
www.fox5ny.com/health/first-human-case-of-virus-spread-by-mosquitoes-reported-in-north-florida#/