Mosquito-borne disease linked to birth defect is pushing northward from Brazil
The latest virus to break out of the tropics may be the most frightening.
Zika virus, which has already blazed across Brazil and pressed northward into Central America and Mexico, now is poised to jump to the United States. Infection typically causes minor or even no symptoms. But in pregnant women, it’s been linked to a birth defect called microcephaly, which leaves babies with abnormally small heads and partially developed brains (SN Online: 12/2/15).