Zika and Chikungunya both are prevailant in more of the rainforest areas. The countries (Brazil & Colombia) are both erradicating them and have almost destroyed the threat. Lead in most US waters are more of a threat.
Wear anti-bug sprays and wristbands. You should be fine. The statistics are more likely you will win the lotto. It's almost a non-thing. Heck this year it's almost on par with Florida.
https://www.paho.org/hq/dmdocuments/2017/2017-phe-zika-situation-report-col.pdf
Americans are very afraid of the world because of the poor news outlets in the world. Grab some time watching colombian news or even European. Way more fair and balanced.
Enjoy your journey and wear sunscreen.
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