That makes perfect sense. I know I wouldn't agree to it as a parent. Just seems like you can't prove a link without that information. I'm very interested to see how this turns out as the media hypes it up I become more and more skeptical. I'm not sure if you're Brazilian but I know the people there are very skeptical of these findings, especially since they can no longer trust their government.
Anyone know why they didn't test babies born without microcephaly whose mothers contracted Zika during pregnancy? It seems to me they're trying to make the link regardless of the science.