Brazil's surge in microcephaly cases has been widely blamed on the Zika virus. Now some claim it might be caused by pesticides, or even vaccines. We asked an NIH expert to sort out what we know from what we don't.
At least 40 seemingly healthy howler monkeys have died in recent months — and scientists are worried it may be a sign they're suffering from one of the new diseases racing across the Americas, like Zika or chikungunya.
President Barack Obama is getting out in front of the fight against the Zika. He's asked Congress for emergency funding to combat the mosquito-borne virus. The money could speed the development of a vaccine, and a much needed diagnostic test for Zika.