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Micro Helminths

Dr. O Test 3 Chapter 12

QuestionAnswer
Intermediate hosts Larval stages (asexual)
Definitive hosts Adult forms (sexual)
Roundworms include... nematodes
Flatworms include... trematodes (flukes), and cestodes (tapeworms)
Nematodes Type of roundworm, cylindrical covered by cuticle, separate male and females, infective stages=egg and larvae
Examples of Nematodes (Roundworms) Pinworm, Whipworm, Hoodworm, Threadworm, Ascaria, Trichinella, Filaria
Enterobius vermicularis (Pinworm) Causes Enterobiasis (nocternal perianal and vulvular pruritis), reservior=humans, spread by autoinfection and close contact, Location=Large intestine
Trichinella spiralis Causes Trichinosis (orbital edema, myalgia, myocarditis, encephalitis) intermediate hosts=rats, pigs, humans, muscles infected by larvae, Location=Small Intestine
Necator americanus and Ancylostoma duodenate Causes iron deficiency anemia, spread by=skin penetration by infective larvae, Location=Small Intestine
Strongyloides stercoralis (Threadworm) Causes Strongyloidiasis (severe cases cause pneumonia and diarrhea), spread by=skin penetration by infective larvae, Location=Small intestine(adult) General Tissue(larvae)
Ascaris lumbricoides Causes MOST COMMON INFECTION, worms passed in stool or vomited, heavy infestations causes pneumonitis and intestinal obstruction, Location=small intestine, spread by=egg ingestion
Wuchereria bancrofti Causes Filariasis which can lead to elephantiasis, spread by=mosquitoes (culex, aedes, and anopheles), Location=lymphatics
Trichuris trichuris Causes Trichuriasis (silent infection, GI problems), spread by=egg ingestion, Location=Large Intestine
Trematodes Type of flukes, flat, leaf shaped, ventral and oral sucker, no body cavity, SNAIL=intermediate host
Blood Flukes Schistosomes
Liver flukes Fasciola, Clonorchis, Opristhorchis
Intestinal flukes Fasciolopsis, Echinostoma
Lung flukes Pargonimus
Schistosoma haematobium Causes Schistosomiasis aka Bilharzia aka Blood Fluke aka Swimmer's itch (hematuria, Genitourinary tract pain), spread by=penetration of skin by larvae, Location=Bladder
Schistosoma japonicum and Schistosoma mansoni Causes Schistosomiasis aka Bilharzia aka Blood Fluke (ascites), spread by=penetration of skin by larvae, Location=Intestine
Fasciola hepatica Causes Fascioliasis (jaundice, enlarged tender liver, anorexia), spread by ingesting vegetation w/ larval stages, Location=Liver
Taenia saginata Beef tapeworm, causes obstruction of biliary, pancreatic, or appendiceal duct, Location=Intestine
Taenia solium Pork tapeworm, causes obstruction of biliary, pancreatic, or appendiceal duct, Location=Intestine
Diphyllobothrium latum Fish tapeworm, causes megaloblastic (pernicious) anemia and neurological irritation, Location=Intestine
Echinococcus granulosus Dog tapeworm, causes Hydatid disease (liver cyst, anaphylaxis), Location=Liver, Lung, Brain
Created by: reeseochoa