This story definitely has a yuck factor.
It's about hookworms.
When hookworm eggs land on moist, warm ground, via human feces, they develop into larvae, raise their tiny selves upward, and wave back and forth, looking for bare feet to latch onto. The parasites penetrate the skin, enter the bloodstream, and eventually migrate to the small intestine — where they settle in, mature and start sucking blood and laying eggs. When the worms and their eggs are passed in a host's stool, the cycle begins anew.