How far will the Zika outbreak spread, and for how long?
Predicting Zika's course in the continental United States is difficult. Health experts have never confronted a virus quite like this one: a mild infection that can nonetheless devastate unborn infants, and that is transmitted by both mosquitoes and sex.
Even tracking cases is hard because so few cause symptoms. “This is such a new thing entomologically that we're all speaking above our pay grade,” said Joseph M. Conlon, a technical adviser to the American Mosquito Control Association.
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