A story which suggests we may be nearer to understanding why Zika causes microcephaly:

http://newsdaily.com/2016/02/researchers-find-new-zika-clues-to-birth-defect-in-fetus-study/

That also suggests the Zika-induced syndrome may be more severe than microcephaly caused by other factors (genetics, other viruses, toxoplasma) - the anatomical variation was extreme and the inflammatory calcifications are not a usual feature.

Of course it doesn't matter how detailed our understanding of the aetiology gets, the pig-ignorant anti-science bigots will still refuse to recognize it.