Necator americanus is a species of hookworm that primarily infects humans. It is a parasitic roundworm that resides in the intestines, where it feeds on blood. This organism is prevalent in tropical and subtropical regions, particularly in parts of Africa, Asia, and Latin America. Infection occurs when larvae penetrate the skin, often through bare feet. Symptoms of hookworm infection can include anemia, fatigue, and abdominal pain. Preventive measures include wearing shoes and improving sanitation to reduce exposure to contaminated soil.