Adult women in Puerto Rico were significantly more likely to develop Zika than men, researchers said, raising new questions about the potential role of sexual transmission of the virus from males to females.

The U.S. Food and Drug Administration issued emergency authorization for a Zika diagnostics test from Swiss drugmaker Roche, skirting normal approval channels as the regulator moves to fight the disease’s spread.

U.S. health and safety officials issued new guidelines on Friday to help protect workers from exposure to Zika, a mosquito-borne and sexually-transmitted virus that causes the birth defect microcephaly and other neurological disorders.   The new rules, issued by the Centers for Disease Control and Prevention and the Occupational Safety and Health Administration, urge employers […]

After several weeks of study and debate, U.S. health officials concluded that infection with the Zika virus during pregnancy causes the birth defect microcephaly, a finding that experts hope will refocus attention on efforts to stop infections and prompt U.S. lawmakers to fund emergency prevention efforts.   “There isn’t any doubt that Zika causes microcephaly,” […]

Brain scans of 23 Brazilian infants with the birth defect microcephaly showed widespread and severe abnormalities suggesting that Zika may invade fetal nerve cells and disrupt brain development.   The findings, published on Wednesday in a letter to the New England Journal of Medicine, are based on a large trove of computed tomography, or CT […]

Evidence is building for the theory that Zika can cause newborn brain defects and the World Health Organization is promising more answers in weeks, but nailing a definitive link will be neither simple nor swift. Picking apart numerous potential connections between mothers who show evidence of infection with the mosquito-borne virus and babies born with […]

The U.S. Centers for Disease Control and Prevention on Tuesday issued guidelines for doctors caring for pregnant women who might have been exposed to Zika virus, a mosquito-borne infection that can cause brain damage in a developing fetus. The new guidelines, first reported by Reuters, lay out recommendations for doctors whose pregnant patients have traveled […]