Zika, like dengue fever and West Nile virus, is in a family of mosquito-borne viruses called flaviviruses. A new study suggests that Zika can be much worse for people previously infected with another flavivirus. In pregnant women, it may put their babies at higher risk for serious birth defects, including microcephaly, a condition in which infants are born with abnormally small heads.
Source: tatoeba (12252552)