Trichostrongylus spp.
المؤلف:
Patricia M. Tille, PhD, MLS(ASCP)
المصدر:
Bailey & Scotts Diagnostic Microbiology
الجزء والصفحة:
13th Edition , p661-662
2025-10-26
55
GENERAL CHARACTERISTICS
Although commonly found in mammals and birds world wide, approximately 10 different species of Trichostrongylus have been found in human infections. The worms are small and live in the mucosa of the small intestine. The adult worm has no visible buccal capsule.
EPIDEMIOLOGY
Human infections have been identified in areas within Asia and Africa. Additionally, approximately 70% of the human population is infected in southwest Iran and a village in Egypt. Infection in humans is acquired by ingestion of plant material contaminated with larvae.
PATHOGENESIS AND SPECTRUM OF DISEASE
Following ingestion of the larvae, the larvae mature and migrate through the lungs. Symptoms are related to the worm burden and the amount of damage within the intestine. See Table 1 for a summarized detail of associated diseases.
Table1. Pathogenesis and Spectrum of Associated Diseases
Table1. Pathogenesis and Spectrum of Disease—cont’d
LABORATORY DIAGNOSIS
Laboratory diagnosis includes identification of eggs or hatched larvae in the stool. The eggs are oval and resemble hookworm eggs except they are slightly longer and more pointed (Figure 1. Larvae should be differentiated from hookworm and S. stercoralis.
Fig1. Trichostrongylus sp. egg. (Courtesy Dr. Henry Travers, Sioux Falls, S.D.)
THERAPY
Anthelmintic agents are recommended including mebendazole and pyrantel pamoate. Albendazole is the treatment of choice.
PREVENTION
Thorough washing of plant material, including cultivated vegetables, before handling or ingestion is recommended.
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