The warning extends to couples even thinking about having children. You should wait at least 8 weeks to try if you've been in the area, the CDC says. And if you're a man who has exhibited symptoms, you should wait a minimum of 6 months.

Disease control experts don't expect to see American Zika outbreaks on the scale of those seen in Central America, the Caribbean and South America. Better overall sanitation and anti-mosquito protections (such as window screens) should reduce the odds of infection. However, it's clear that the CDC isn't taking any chances -- it wants to contain even the slightest hint of Zika before it becomes a serious crisis.