The CDC has issued new guidelines advising men who have traveled or live in an active Zika virus area, to use protection during sex with a pregnant partner.
Pregnant women returning from areas without the Zika virus are now encouraged to be tested between two and twelve weeks after their return.
There are now at lest 50 cases of the Zika virus nationwide.
It has been found in at least 13 states and nation's capitol.
Dr. Trish Perl, senior epidemiologist with Johns Hopkins Hospital, helps put the issue In Focus.