Zika virus and its link to babies being born with microcephaly - a smaller than normal head - are in the news a lot at the moment. I didn't realise that this link, although strongly suspected, hasn't yet been proved.
One of the reasons researchers suspect the link is that about six months after Zika was confirmed in Brazil, cases of microcephaly started to increase.
Understanding the virus better and how it might cause microcephaly is now the focus of research. I wonder how hard it might be to fight the disease without this knowledge.