As the number of all the visitors (and athletes) of Olympics is far smaller than the number of &quot;normal people&quot; currently traveling to those areas, and we&#x27;ve yet to see any Zika cases outside of Brazil, then this means that it&#x27;s quite likely that the actual impact of that will be zero.<p>Yes, it&#x27;s likely that someone of them will contract Zika and bring that home with them to spread - but it&#x27;s more likely that it will not happen, and the effect is dwarfed by the chances that the spread will be caused by the ordinary flow of people, and cancelling the Olympics will have no effect on that.