Scientists attach an antibody to female mosquitoes preventing them from spreading all 4 types of dengue fever.
Scientists have struggled with estimating the risk of the Zika virus to pregnant women in the past, but now they have a clearer picture.
Researchers at the University of Pennsylvania are reporting early success with a Zika vaccine, one that could protect people with a single dose.
Officials at the CDC now say men who have had any possible exposure to the Zika virus should wait six months before trying to conceive.
Officials urge residents to practice safe sex, "especially if they have traveled to an area with Zika-infected mosquitoes."
The CDC had asked doctors in Florida to test all pregnant women in the state for the virus - regardless of whether they were in an area known to have Zika, and regardless of whether they had symptoms.