We'll get through litres of insect repellent
I reckon Zika will be a distant memory by the time August comes around. From what I've heard, the cooler, drier weather of Brazil's winter season will naturally kill off most of the disease-carrying mosquitoes.
Combine this with the organising committee's diligent approach to fumigation and reducing standing water and I'm confident the risk will be minimal. I imagine that as a team we'll get through litres of insect repellent - but we'd probably be using it anyway.