Thirty people have been diagnosed with a rare paralyzing condition caused by Zika virus infection in Puerto Rico, the territory's health department said Thursday.
And Centers for Disease Control and Prevention director Dr. Thomas Frieden says he expects even more cases of Guillain-Barre syndrome in Puerto Rico because the virus is infecting so much of the population, NBC News reported.
"We think there will be as many as 200 additional cases, given the overall number of infections there," Frieden told NBC News.