Strange that governments urge women not to get pregnant and do not urge men not to get women pregnant.

I think it is ridiculous to demand that either men or women go without sex for years, when a better solution is available.

There is no solid proof that Zika causes microencephaly, but evidence is accumulating. There's enough evidence to base practical decisions on the likelihood. Life decisions cannot always wait for scientific certainty, which can take many years to achieve.

It is plausible for an insecticide to cause birth defects, but implausible that the insecticide alone could explain the big increase in microencephaly between 2014 and 2015 in Brazil.

Perhaps the microencephaly results from the combination of Zika and a pesticide. Or maybe this idea can be ruled out, if some of the cases occurred in cities and the pesticide is used only on farms.