The number of missing cases of microcephaly epidemic in several countries raises serious questions about the assumed connection between Zika and microcephaly finds a new study. The epidemic of microcephaly -- a birth defect where a baby's head is smaller -- in Brazil has raised serious questions about its assumed connection with Zika virus a new study explains. Prenatal Zika virus infection has been linked to adverse pregnancy and birth outcomes most notably microcephaly and other serious brain anomalies. The structure of Zika virus decoded. In Brazil the microcephaly rate soared with more than 1500 confirmed cases. A new study