Necator americanus is a species of hookworm that lives in the small intestine of hosts such as humans, dogs, and cats. Ancylostoma duodenale and Necator americanus are the two human hookworms that are discussed together as the cause of hookworm infection. These worms can cause anemia in affected patients by biting and sucking blood from the intestinal wall. Transmission occurs when larvae penetrate the skin, typically when patients walk barefoot on contaminated sand or soil. This may cause cutaneous larva migrans, characterized by a serpiginous, pruritic rash near the site of penetration. Treatment is with bendazoles, pyrantel pamoate, or ivermectin.