"Understanding the answers to these questions is important, as the size and scope of this outbreak will continue, since no one has immunity," Staples said.
So far in the United States, 82 people have contracted Zika while abroad and then traveled back into the country, according to the Centers for Disease Control and Prevention. There's not a single known case of someone contracting Zika from a mosquito in the United States.
19:44 Shadow president or mere shadow? In Europe, Pence seeks to reassure allies unnerved by Trump14
00:02 Omar Abdel Rahman, imprisoned ‘blind sheikh’ linked to terrorist efforts, dies at 7822
11:30 Pence and Merkel embrace NATO but differ on transatlantic partnership23
12:33 U.S.' Tillerson calms allies on Syria ahead of Geneva talks16