Massive Study Casts Doubt on Zika As Cause of Microcephaly
Preliminary results published in the New England Journal of Medicine (NEJM) found that of nearly 12,000 pregnant women from Columbia who were infected with the Zika virus, none gave birth to babies with microcephaly. While four cases of the brain defect were reported with mothers who did not have Zika symptoms and were not participating in the study, that number of cases is what would statistically be expected.