Kate Kelland
Thu Sep 15, 2016

Early results from a crucial case-control study in Brazil have confirmed a direct causal link between Zika virus infection in pregnant women and the brain damaging birth defect microcephaly in their babies, scientists said on Thursday.
But while preliminary findings from the first 32 cases involved in the study confirm causality, the researchers said, the true size of the effect will become clear only after full analysis of all 200 cases and 400 controls.
The study, published in The Lancet Infectious Diseases journal, was requested by the Brazilian health ministry to investigate the causes of the microcephaly epidemic that the World Health Organization (WHO) declared an international public health emergency earlier this year.

Read more: http://www.reuters.com/article/us-he...ealth%20Report