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Micro Helminths
Dr. O Test 3 Chapter 12
| Question | Answer |
|---|---|
| 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
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