You are correct. That said, it's in Brazil where the first linking of Zika and microcephaly has been considered. A link between the two is circumstantial at this point. That is why earlier I said the next few weeks will tell the tale. Larva spraying did take place. There has been a Zika outbreak. I don't doubt epidemiologists are looking at areas of concentration and wondering why there seem to be more mothers from Brazil giving birth to microcephalic children than elsewhere (on a per capita basis). Same mosquito, same virus, different results in terms of new-borns being microcephalic. So is there something else happening there that isn't in other places?

I think the WHO has jumped on this quickly and I hope the speed with which they are banging the gong is not blinding them to all the possibilities. (I expect they are still chagrined over their ineptitude during the Ebola outbreak.)

We'll see what the epidemiologists come up with. I agree it's a good idea to develop a vaccine for the virus, but if there is a higher number of children born with microcephaly in Brazil than most other places that have the mosquito and the virus, then perhaps there is something else causing and/or contributing to that.