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Fear and misinformation about the Zika virus still abound, according to a new survey released by the University of Pennsylvania’s Annenberg Public Policy Center. Most notably, the survey finds that more than a third of respondents incorrectly believe that genetically modified mosquitoes have caused the spread of the disease.

The survey, which was conducted this month by telephone, included 1,014 respondents in the U.S. It included eight questions probing participants’ knowledge about the disease and its transmission and their level of concern about it. Some questions suggested a high level of knowledge about the disease on certain fronts. Ninety-one percent of respondents were aware that mosquitoes transmit the virus, for instance, and two-thirds of respondents said they were familiar with news reports about Zika.

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On the other hand, fewer than half of the participants correctly identified Brazil as the country with the largest current Zika outbreak. Nearly 20 percent of respondents incorrectly believe that it’s possible to contract the virus by sitting next to an infected person. In fact, Zika is primarily transmitted by infected mosquitoes, although it could also be contracted by blood or sexual contact with an infected person.