In the Jungle (and pretty much any other wild fishing locale) it isn’t the big toothy animals you have to worry most about...it’s the bugs. Mosquitoes kill more people worldwide than all the lions, tigers, jaguars, sharks, and poisonous snakes put together. I took a full course of preventive vaccines and meds before and after the trip, to block Yellow Fever, Typhoid, and Malaria, and other issues. Surprisingly (thankfully), we didn’t encounter many mosquitoes on the river during Bolivia’s dry season. But we did deal with sand fleas and other small bugs. I didn’t mess around; I slathered 3M Ultrathon on my face and limbs during the entire trip.  Having bug dope in many individual packets was key, as I didn’t have to worry about losing the main tube of insect repellent, and could carry them in my pockets.