Hookworm - Mouth of the Organism

This photograph shows the front section of the hookworm, and the mouth parts which it uses to feed. The chitinous plates, used to attach to the lining of the intestine where they suck blood for nourishment, are visible. Three species of hookworm cause infection in the United States, including this species, Necator americanus. (Courtesy of the Centers for Disease Control.)

Hookworm - Close-Up of the Organism

This is the mouth part of the hookworm Ancyclostoma duodenale. The hookworm uses curved sharp teeth to attach to the lining of the intestine where it sucks blood for nourishment. (Courtesy of the Centers for Disease Control.)

Hookworm - Ancyclostoma Caninum

This is a photograph of the hookworm's appearance against the lining of the intestine (intestinal mucosa). (Courtesy of the Centers for Disease Control.)

Hookworm Egg

This is a photomicrograph of a hookworm egg. Hookworms hatch in damp vegetation. Their larvae can enter through the skin, even without cuts or abrasions. Once through the skin they begin the next step of their life cycle.

Hookworm Rhabditiform Larva

The larva of a hookworm is visible in the center of this photograph.

Digestive System Organs

The digestive system organs in the abdominal cavity include the liver, gallbladder, stomach, small intestine and large intestine.