How Zika became the prime suspect in microcephaly mystery

Virus can damage cells key for developing brains

baby with microcephaly

SIZING UP  A doctor measures the head circumference of a baby girl in Brazil. The measurement can offer a quick way to gauge whether a newborn has microcephaly, a birth defect that leaves babies with underdeveloped heads and brains. 

© Flavio Forner/Xibe Images/Corbis

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