Open water swimmers will be swimming in dirty water, sailors all ready have been. The Guardian wrote: Rio 2016: &#x27;Chance of infection very likely&#x27; after tests show extent of pollution...<p>Maybe the tourists won&#x27;t swimming in stagnant water where mosquitoes breed but tourists will be attending nearby while athletes swim in it.<p><a href="https:&#x2F;&#x2F;www.theguardian.com&#x2F;sport&#x2F;2015&#x2F;dec&#x2F;02&#x2F;rio-olympics-2016-water-pollution" rel="nofollow">https:&#x2F;&#x2F;www.theguardian.com&#x2F;sport&#x2F;2015&#x2F;dec&#x2F;02&#x2F;rio-olympics-2...</a>