Zika outbreak in Brazil: Doctors study mothers and babies for proof that virus causes microcephaly

Doctors and researchers in Brazil are studying mothers and babies in an attempt to answer the most urgent question of the country's Zika outbreak: Is the virus causing a spike in birth defect of microcephaly, and, if so, how great is the risk? Microcephaly is a condition where a baby is born with a significantly smaller skull than would be expected. It is usually a rare neurological condition but has been occurring in Brazil with increasing frequency since the Zika outbreak.