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2011nematodes1 - 1 Classification • Phylum Nematoda –...

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Unformatted text preview: 11/17/2011 1 Classification • Phylum Nematoda – Class Adenophorea • Order Trichocephalida – Genera: Trichuris / Trichinella – Class Secernentea – Subclass Rhabditida • Order Rhabditia (suborder Rhabditina) – Genus: Strongyloides • Order Strongylida – Genera: Ancylostoma,Necator • Order Ascaridida – Genera: Ascaris,Toxocara, Anisakis / Enterobius • Order Spirurida – Genera: Wuchereria,Brugia, Onchoerca, Loa, Dirofilaria / Dracunculus Intestinal Nematodes Trichuris trichiuria • Size ‐ <50mm • Lack an excretory system • Have a capillary like esophagus • Do not have Phasmids • Are monodelphic 11/17/2011 2 Trichuris Trichiura (The whipworm) stichocytes Life Cycle L3 11/17/2011 3 Epidemiology • Distributed worldwide. More prevalent in tropics. • Millions infected worldwide (~800 million) • In U.S.(especially S.E) Trichuris is the second most prevalent nematode after Enterobius . • 2.2 million cases in US • Humans acquire infection by ingesting parasite eggs in food or water or soil....
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2011nematodes1 - 1 Classification • Phylum Nematoda –...

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