Читать книгу Practical Guide to Diagnostic Parasitology - Lynne Shore Garcia - Страница 60

The largest number of helminthic parasites of humans belongs to the roundworm group. Nematodes are elongate-cylindrical and bilaterally symmetrical with a triradiate symmetry at the anterior end. They have an outer cuticle layer, no circular muscles, and a pseudocoelom containing all systems (digestive, excretory, nervous, and reproductive). These organisms are normally acquired by ingestion of their eggs or skin penetration by larval forms from the soil. Nematodes commonly parasitic in humans include Trichuris trichiura, Necator americanus, Ancylostoma duodenale, Enterobius vermicularis, Ascaris lumbricoides, Strongyloides stercoralis, and Trichostrongylus spp.