An infected patient in Texas had not travelled to infected areas, but their partner had returned from Venezuela.
Zika is carried and primarily transmitted by mosquitoes and its spread has been declared a global health emergency by the World Health Organization.
It has been linked to the births of thousands of babies in South America with under-developed brains.
Dr Edward Wright, a virologist from the University of Westminster, says the focus should remain on those countries where the mosquitoes are present, rather than on the cases appearing further afield.
IN: "It's not…
OUT: …the globe."
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http://fsnradionews.com/feeds/0203zika-wright1.mp3