The pictures from Brazil are heartbreaking: baby after baby born with a small head and damaged brain after an attack by the Zika virus during pregnancy. The official numbers are equally disturbing: The rate of birth defects involving the nervous system nearly doubled across Brazil after Zika arrived.

This stark statistical reality was discovered by a team of researchers from Brazil’s Oswaldo Cruz Foundation, which analyzed hospital records across Brazil from 2008, well before Zika arrived, until the end of February 2016. Continue reading.