Keystone virus has made the jump from mosquitoes to humans, with a case now confirmed in Florida.
A 16-year-old boy is the first confirmed case and researchers believe the virus could be widespread in North Florida.
It is spread by a mosquito cousin to the Aedes aegypti, which was responsible for spreading Zika. Researchers from the University of Florida identified the Keystone virus in the teenager after he visited an urgent care clinic in North Central Florida.
Medical professionals suspected he had Zika virus, as his case was seen during a Zika outbreak. But he tested positive for the Keystone virus.
A report of his case has now been published in the journal Clinical Infectious Diseases.
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