Nature: Brazil asks whether Zika acts alone to cause birth defects
“Government researchers in Brazil are set to explore the country’s peculiar distribution of Zika-linked microcephaly — babies born with abnormally small heads. Zika virus has spread throughout Brazil, but extremely high rates of microcephaly have been reported only in the country’s northeast. Although evidence suggests that Zika can cause microcephaly, the clustering pattern hints that other environmental, socioeconomic, or biological factors could be at play…” (Butler, 7/25).