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Definition Return to top
Hookworm is a roundworm infestation affecting the small intestine and lungs. The worms are about 1/2 inch long.
Causes Return to top
The disorder is caused by infestation with the roundworms Necator americanus, Ancylostoma duodenale, Ancylostoma ceylanicum, or Ancylostoma braziliense. The first two occur in humans only. The last types also occur in animals.
Hookworm disease is widespread in the moist tropics and subtropics, and it affects over 1 billion people worldwide. In developing nations, the disease indirectly causes the death of many children by increasing their susceptibility to other infections that could normally be tolerated.
There is very little risk of contracting the disease in the U.S. because of advances in sanitation and control of wastes.
The larvae (immature form of the worm) penetrate the skin, where an itchy rash called ground itch may develop. The larvae migrate to the lungs via the bloodstream, enter the airways and cause coughing.
After traveling up the windpipe, the larva are swallowed. When the larvae are swallowed, they infect the small intestine and develop into adult worms. Adult worms and larvae are excreted in the feces.
Most people have no symptoms once the worms enter the intestines. However, iron deficiency anemia caused by loss of blood may result from heavy infestation.
Symptoms Return to top
Note: There are often no symptoms.
Exams and Tests Return to top
Tests that can help diagnose the infection include:
This disease may also alter the results of a D-xylose absorption test.
Treatment Return to top
The goals of treatment are to:
Parasite-killing medications such as albendazole, mebendazole or, pyrantel pamoate are usually prescribed. Ivermectin, used for other worm infections, does not work for hookworm infections.
Symptoms and complications of anemia are treated as they arise. The doctor will likely recommend increasing the amount of protein in your diet.
Outlook (Prognosis) Return to top
Complete recovery occurs if treatment is given before serious complications develop. The infection is easily eradicated with treatment.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call for an appointment with your health care provider if symptoms of hookworm infection develop.
Prevention Return to top
Improvement in sanitation measures in developing countries is necessary for prevention of infection.
References Return to top
Kazura JW. Nematode infections. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 378.Update Date: 9/28/2008 Updated by: Jatin M. Vyas, PHD, MD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.