Hoping to hit the hig notes as Whitney Houston did 25 years ago. But first the nightline 5. The bold nissan rogue with intuitive allwheel drive. Because winter needs a hero. Nissan. Seconds. Good evening. Thanks for joining us. The mysterious disease causing were in brazil, ground zero of the zika outbre, with disisse detectives trying to stop the contagion from spreading. The World Health Organization declaring a Global Health emergency. Here in the u. S. With at least 50 cases now confirmed there is mounting concern. Heres abcs chief medical editor dr. Richard besser. Reporter 3monthold ann beatrice, whos like any normal baby but anna was born with microcephaly, an extremely small head, due to abnormal brain development. A devastating neurological condition that doctors suspect is linked to zika virus infection during pregnancy. In brazil the barbosa family is one of thousands of families dealing with the virus. Roughly 150 cases of microcephaly occurred in brazil in 2014. Last year,