- CDC director says Zika is our newest threat
- He says most people in the contiguous U.S. are unlikely ever to come into contact with the virus
Tom Frieden is director of the U.S. Centers for Disease Control and Prevention.
(CNN)Vaccines and antibiotics have made many infectious diseases a thing of the past; we've come to expect that public health and modern science can conquer all microbes. But nature is a formidable adversary. And Zika is our newest threat, particularly to pregnant women.