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 commonly found in tropical and subtropical regions, particularly in areas with poor sanitation and hygiene practices. Infection occurs when larvae penetrate the skin, often through bare feet. Symptoms of Necator americanus infection can include abdominal pain, anemia, and fatigue due to blood loss. Preventive measures include wearing shoes, improving sanitation, and proper hygiene practices to reduce the risk of exposure to the larvae.