Campers should be more afraid of ticks than tent spiders, freak thunderstorms, or toilet paper shortages. As Vox’s reports, cases of Lyme disease in the U.S. have nearly tripled in the last two decades—and experts say this spike is partly due to climate change.

Warmer winters have allowed the tiny, bloodsucking arachnids to migrate north, which has resulted in an increase of Lyme cases in the northeast U.S. Meanwhile, higher-than-normal temperatures have boosted ticks' reproduction cycles, meaning there’s more of them, and thus more chances to contract Lyme disease. Toss in some other factors—including growing deer populations and the reforestation of former farmlands—and a surge in the dangerous illness seems only inevitable.

Get the whole story, and learn how to protect yourself from the bacteria-carrying critters, by watching the video below.