Strongyloides stercoralis


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Related to Strongyloides stercoralis: Trichinella spiralis, Ascaris lumbricoides, Trichuris trichiura

Strongyloides stercoralis

A roundworm that causes gastrointestinal infections (primarily in persons from developing nations) and opportunistic infections (in immunosuppressed patients). It may occasionally be life-threatening. In the U.S., S. stercoralis is found mainly in the rural South. The ova hatch in the intestines of the host, and rod-shaped larvae are passed in the stool. In the soil, these may develop into adults and continue their life cycle or may metamorphose into filariform larvae that can infect humans. The filariform larvae enter the skin, pass through the venous system to the lungs, where they migrate upward and are swallowed. A rash or pneumonia may accompany their migration. The larvae mature in the intestine, and ova of the next generation hatch. The rod-shaped larvae may metamorphose into the filariform larvae in the intestine. These may enter the circulation, migrate to the lungs, and begin the cycle again.

Such auto-infection may be sufficient to cause overwhelming systemic infection with fever, severe abdominal pain, shock, and possibly death. Severe reactions are more likely to occur in immunosuppressed patients. The diagnosis is made by finding larvae in the patient's feces. Thiabendazole and mebendazole are the drugs of choice. Repeated courses of treatment may be required.

See also: Strongyloides
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References in periodicals archive ?
Faecal examinations, including direct smear and Baermann method, revealed that the dog was severely infected by a parasitic nematode, Strongyloides stercoralis, with a count of 1,200 larvae per gram of faeces.
Strongyloides stercoralis is a soil transmitted intestinal nematode that is endemic in many tropical and subtropical areas of the world.
Trichrome stains on smears prepared from stool concentrates on all three specimens were negative for protozoa but revealed Strongyloides stercoralis rhabditiform larvae.
Strongyloides stercoralis. Retrieved July 7, 2007 from, www.emedicine.com/emerg/topic84 3.htm.
Sensory neuroanatomy of a skin-penetrating nematode parasite: Strongyloides stercoralis. I.
Neafie, "Diagnosis of Strongyloides stercoralis in a peritoneal effusion from an HIV-seropositive man," Acta Cytologica, vol.
Strongyloides stercoralis accounted for a highest prevalence (43.7%) of all the intestinal nematodes excreted by the cats.
Some of the common parasites found in immunosuppressed patients are Giardia lamblia, Entamoeba histolytica, Strongyloides stercoralis, Cryptosporidium parvum, Cyclospora cayeatanensis, Isospora belli, and Microsporidia spp.
Her negative O&P test upon arrival to the United States did not, however, eliminate the possibility of Strongyloides stercoralis, which often goes undetected in routine O&P samples.