dr. trudy larson is here for tonight's ask the doctor. she's the director of nevada's schools of community health sciences. 1 what is the likelihood we could see the zika virus here? 2 it's largely transmitted through pregnant women aren't the only ones who should take precaution? 3 if someone contracts the virus, for how long can they transmit it? and what precautions must they take - to prevent from spreading it? 4 guillain-barre syndrome has also been linked to zika? the centers for disease control and prevention released new guidelines aimed at preventing sexual transmission of the zika virus which, experts say, is evolving rapidly. the cdc now says men exposed to the zika virus and who have a pregnant partner should use a condom or abstain from sex until the baby is born. cdc director dr. tom with zika is protecting pregnant women and their unborn babies from a neurological disorder known as microcephaly. microcephaly results it babies being born with abnormally small heads that can lead to severe developmental delays or even death.