Podcast
Questions and Answers
Match the following parasites with their primary mode of transmission:
Match the following parasites with their primary mode of transmission:
Trichinella spiralis = Eating undercooked infected pork or other animals Wuchereria bancrofti = Mosquito bite Capillaria philippinensis = Eating improperly cooked or raw freshwater fish Unspecified = Direct Contact
Match the following parasites with their primary site of infection:
Match the following parasites with their primary site of infection:
Trichinella spiralis = Small intestines for 1-4 months; larvae encysted in muscle tissue Wuchereria bancrofti = Lymph nodes, lymphatic ducts Capillaria philippinensis = Small intestines Unspecified = Bloodstream
Match the following parasites with their diagnostic methods:
Match the following parasites with their diagnostic methods:
Trichinella spiralis = Serology and muscle biopsy (larvae) Wuchereria bancrofti = Blood smear for microfilariae Capillaria philippinensis = Eggs detection in stool specimen Unspecified = X-Ray Imaging
Match the following parasites with their treatments:
Match the following parasites with their treatments:
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Match the following parasites with their symptoms:
Match the following parasites with their symptoms:
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Match the following parasites with their egg morphology:
Match the following parasites with their egg morphology:
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Match the intestinal nematode parasites with their mode of transmission:
Match the intestinal nematode parasites with their mode of transmission:
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Match the intestinal nematode parasites with their primary site of infection:
Match the intestinal nematode parasites with their primary site of infection:
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Match the following parasitic infections with their primary mode of transmission:
Match the following parasitic infections with their primary mode of transmission:
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Match the intestinal nematode parasites with their egg morphology:
Match the intestinal nematode parasites with their egg morphology:
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Match the following parasites with their primary site of infestation:
Match the following parasites with their primary site of infestation:
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Match the intestinal nematode parasites with their disease manifestations:
Match the intestinal nematode parasites with their disease manifestations:
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Match the intestinal nematode parasites with their treatment:
Match the intestinal nematode parasites with their treatment:
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Match the following parasitic infections with their characteristic manifestations:
Match the following parasitic infections with their characteristic manifestations:
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Match the following parasites with their egg morphology:
Match the following parasites with their egg morphology:
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Match the intestinal nematode parasites with their adult worm morphology:
Match the intestinal nematode parasites with their adult worm morphology:
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Match the following parasites with their diagnostic methods:
Match the following parasites with their diagnostic methods:
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Match the following parasitic infections with their treatment options:
Match the following parasitic infections with their treatment options:
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Study Notes
Nematodes
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Capillaria philippinensis (Pudoc Worm)
- Parasite found in small intestines
- Mode of transmission: eating improperly cooked or raw freshwater fish; autoinfection
- Diagnosis: eggs detection in stool specimen; larvae can sometimes be demonstrated in stool
- Egg morphology: 35-45um long; 20-25um wide; may contain developing embryo
- Adult worm morphology: male - 2-3.5mm long; female - 2.5-4.5mm long
Blood and Tissue Nematodes
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Trichinella spiralis (Muscle worm)
- Parasite found in small intestines for 1-4 months; larvae encysted in muscle tissue
- Mode of transmission: eating undercooked infected pork or other animals
- Diagnosis: serology and muscle biopsy (larvae)
- Larvae morphology: 125um long x 7um wide; many encysted forms are found in striated muscle tissue
- Disease: Trichinellosis/Trichinosis
- Treatment: Albendazole + steroids (for severe symptoms)
-
Wuchereria bancrofti (Bancroft’s Filarial worm)
- Parasite found in lymph nodes, lymphatic ducts
- Mode of transmission: mosquito bite
- Diagnosis: blood smear for microfilariae
- Adult worm morphology: up to 1mm long and reside in intestinal tract
- Microfilariae characteristics: 250-300um in length; no nuclei in the tail; sheath is present
- Disease: Filariasis/Elephantiasis
- Treatment: Diethylcarbamazine
Intestinal Nematodes
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Enterobius vermicularis (Pinworm/Seatworm)
- Parasite found in lumen of cecum; colon
- Mode of transmission: ingestion of eggs, self-contamination or auto-infection
- Diagnosis: scotch tape test (perianal); microscopic egg examination from stool
- Egg morphology: 50-60um in width; oval with one side flat, thick shell and double-walled; ovum contains developing embryo
- Disease: Enterobiasis
- Treatment: Pyrantel pamoate; Mebendazole
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Trichuris trichiura (Whipworm)
- Parasite found in cecum, colon
- Mode of transmission: ingestion of eggs from fecally contaminated soil or food
- Diagnosis: stool exam for eggs microscopically
- Egg morphology: 50-60um in length x 25um in width, football shaped with clear plugs at each end; smooth and yellow to brown shell; eggs contain developing embryo
- Disease: Trichuriasis
- Treatment: Mebendazole; Albendazole
-
Ascaris lumbricoides (Common Roundworms)
- Parasite found in small intestines
- Mode of transmission: ingestion of eggs from fecally contaminated soil or food
- Diagnosis: eggs detection in stool sample; larvae examination in sputum specimen
- Egg morphology: infertile ova measure up to 90um in length; fertile eggs are round measuring 75um in length and 50um in width; shell is thick and contains developing embryo
- Adult worm morphology: female – 20-30cm long; males- 15-31cm long with a curved posterior end
- Disease: Ascariasis
- Treatment: Albendazole; Mebendazole
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Ancylostoma duodenale (Old World Hookworm) & Necator Americanus (New World Hookworm)
- Parasite found in small intestines
- Mode of transmission: larvae in soil penetrate skin; autoinfection (rare)
- Diagnosis: stool exam; sputum exam or bronchial lavage for rhabditiform larvae
- Egg morphology: oval; 56-75um long x 36-40um wide; thin-shelled eggs and sometimes contain developing embryo
- Adult worm morphology: firmly attach to intestinal mucosa (rarely seen); 7-11mm long (Ancylostoma tends to be slightly larger than Necator worms); buccal cavity of Necator contains a pair of cutting plates while Ancylostoma has teeth
- Disease: Hookworm infection
- Treatment: Albendazole; Mebendazole
-
Strongyloides stercoralis (Threadworm)
- Parasite found in small intestines
- Mode of transmission: larvae in soil penetrate skin; autoinfection (rare)
- Diagnosis: stool exam; sputum exam or bronchial lavage for rhabditiform larvae
- Egg morphology: oval; 56-75um long x 36-40um wide; thin-shelled eggs and sometimes contain developing embryo
- Disease: Strongyloidiasis/Cochin China Diarrhea
- Treatment: Albendazole; Mebendazole
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Description
Test your knowledge on intestinal nematodes, their characteristics, and infections. Covering Enterobius vermicularis and Trichuris trichiura, this quiz is ideal for students of parasitology and medical professionals.