COSTELLO: "Spreading explosively around the Americas," those words from the head of the World Health Organization speaking about the Zika virus this morning -- the level of alarm now extremely high. Happening now in Geneva, the organization is holding a virtual press conference about the virus. Zika is linked to devastating birth defects at even death in babies. CNN's chief medical correspondent Dr. Sanjay Gupta is with me now with more. Good morning.</s>DR. SANJAY GUPTA, CNN CHIEF MEDICAL CORRESPONDENT: Good morning. Yes. This is a stern sort of announcement from the WHO -- different in some ways what we heard from WHO on Ebola. Remember, there was a lot of criticism that WHO wasn't fast enough. This time, using some very frank language, saying the level of alarm is extremely high, talking about the fact that it has spread pretty considerably and will likely continue to spread. And also the fact that, you know, there wasn't a lot done with Zika virus for a long time.
WHO Director: Zika Virus is "Spreading Explosively".