While the report details the number of cases, the CDC hasn't yet provided specific information regarding the outcomes of any of these pregnancies. The largest concern, of course, is the development of microcephaly, a condition in which babies are born with abnormally small heads. Earlier last month, the CDC announced that they had enough conclusive evidence to support the idea that infection with the Zika virus is causing microcephaly. In Brazil and other areas in South America, where the disease is rampant, there have already been hundreds of cases of babies born with the condition. At present, there is no effective treatment for Zika, no way to prevent microcephaly from occurring, nor a vaccine to prevent infection, though several vaccines look potentially promising.