The bulk of the tourism to Brazil is either from Central &amp; South America, which already has the virulent strain of Zika, or it&#x27;s from Europe and northern North America, which does not have the Aedes Aegypta mosquita.<p>Olympics tourism will be much more widespread, including many from vulnerable areas in Africa and Asia.<p>And the OP does not say that it will prevent the spread of Zika, only slow it.    Even a few extra months could be valuable -- lots of effort is currently being spent looking for a vaccine.