The is a disease caused by protozoan parasites of the genus Leishmania and spread by the bite of certain types of sandflies.
After hydrating, they realize that their awesome shelter is built under a Chechen tree.
But when the challenge overwhelms one of them, the other must forage, trap and even kill to keep a glimmer of hope alive.
There's a catastrophic hurricane in Belize, constant downpours in Panama and bubbling mud volcanoes in Trinidad.
Steven tapped out on Day 12 after suffering an eye injury and from loneliness.
Large fires are their defense against predators and hypothermia until the flames fan out of control and become the biggest threat.
They continue with a nearby jaguar, and Jesse takes on bees.
Season 10 took contestants to the frozen tundra of Alaska and an African Kill Zone.