<human>: I've been hearing a lot of news about the Zika virus. Is it a serious health concern?
<bot>: Yes, the Zika virus is a serious health concern. It can cause birth defects and neurological problems in babies born to mothers who are infected during pregnancy. It has also been linked to Guillain-Barre syndrome, which causes temporary paralysis. The World Health Organization (WHO) has declared the outbreak a Public Health Emergency of International Concern.