A female Aedes aegypti mosquito acquires a blood meal on the arm of a researcher at the Biomedical Sciences Institute in the Sao Paulo's University in Sao Paulo, Brazil in this Jan. 18, 2016, file photo. AP Photo/Andre Penner, File
Officials are warning pregnant women not to travel to southern Arizona or Mexico’s Sonora state after cases of Zika recently cropped up.
Mexico has never left the list of countries affected by the virus, but the increase in cases in Sonora, with 45 confirmed in the last two weeks, has concerned officials and prompted the warning.
