Brazil has reported more than 4,000 cases of microcephaly, a birth defect where babies develop small heads
Brazil has reported more than 4,000 cases of microcephaly, a birth defect where babies develop small heads. Pediatric neurologist Dr. Vanessa van der Linden first noticed the defect in August, and helped jump-start the response. Dr. Jon LaPook spoke to Dr. van der Linden about how she connected the dots.
