Nematodes Parasites Quiz
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Questions and Answers

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:

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:

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:

<p>Trichinella spiralis = Albendazole + steroids (for severe symptoms) Wuchereria bancrofti = Diethylcarbamazine Capillaria philippinensis = Albendazole Unspecified = Antiviral medications</p> Signup and view all the answers

Match the following parasites with their symptoms:

<p>Trichinella spiralis = Trichinellosis/ Trichinosis Wuchereria bancrofti = Filariasis/ Elephantiasis (enlarged extremities with loss of skin elasticity); hydrocele (accumulation of fluid in the scrotum) Capillaria philippinensis = Intestinal obstruction, severe diarrhea, and weight loss Unspecified = Malaria-like symptoms</p> Signup and view all the answers

Match the following parasites with their egg morphology:

<p>Capillaria philippinensis = Eggs: 35-45um long; 20-25um wide; may contain developing embryo Trichinella spiralis = Larvae: 125um long x 7um wide; many encysted forms are found in striated muscle tissue Wuchereria bancrofti = Microfilariae characteristics: 250-300um in length; no nuclei in the tail; sheath is present Unspecified = Ova characteristics not specified</p> Signup and view all the answers

Match the intestinal nematode parasites with their mode of transmission:

<p>Enterobius vermicularis = Ingestion of eggs from fecally contaminated soil or food Trichuris trichiura = Ingestion of eggs, self-contamination or auto-infection Ascaris lumbricoides = Larvae in soil penetrate skin Ancylostoma duodenale = Ingestion of eggs from contaminated water</p> Signup and view all the answers

Match the intestinal nematode parasites with their primary site of infection:

<p>Enterobius vermicularis = Small intestines Trichuris trichiura = Cecum, colon Ascaris lumbricoides = Lumen of cecum; colon Ancylostoma duodenale = Lungs</p> Signup and view all the answers

Match the following parasitic infections with their primary mode of transmission:

<p>Hookworm infection = Larvae in soil penetrate skin; autoinfection (rare) Ascariasis = Ingestion of contaminated food and water Strongyloidiasis = Fomites or contaminated food and water Threadworm = Larvae through skin, lungs</p> Signup and view all the answers

Match the intestinal nematode parasites with their egg morphology:

<p>Enterobius vermicularis = Eggs size: 50-60um in length x 25um in width, football shaped with clear plugs at each end Trichuris trichiura = Egg size: 50-60um in width; oval with one side flat, thick shell and double-walled Ascaris lumbricoides = No distinct egg morphology mentioned Ancylostoma duodenale = Eggs size: 40-60um in length x 20-30um in width, cylindrical shaped with thick shell</p> Signup and view all the answers

Match the following parasites with their primary site of infestation:

<p>Ancylostoma = Small intestines Necator Americanus = Lungs and small intestines Ascaris = Small intestines Strongyloides = Small intestines and lungs</p> Signup and view all the answers

Match the intestinal nematode parasites with their disease manifestations:

<p>Enterobius vermicularis = Ulcerative colitis; chronic dysentery (bloody, mucoid diarrhea), severe anemia, growth retardation Trichuris trichiura = Pruritus ani; intestinal irritation, mild nausea; deprived of sleep and irritable due to itchiness Ascaris lumbricoides = No distinct disease manifestations mentioned Ancylostoma duodenale = Intestinal obstruction, diarrhea, vomiting</p> Signup and view all the answers

Match the intestinal nematode parasites with their treatment:

<p>Enterobius vermicularis = Mebendazole; Albendazole Trichuris trichiura = Pyrantel pamoate Ascaris lumbricoides = Mebendazole Ancylostoma duodenale = Pyrantel pamoate; Mebendazole</p> Signup and view all the answers

Match the following parasitic infections with their characteristic manifestations:

<p>Hookworm infection = Steatorrhea (fats in stool); other symptoms similar to ascariasis Ascariasis = Abdominal pain; vomiting, fever; asthma; pneumonia; eosinophilia Strongyloidiasis = Pruritic papules or vesicle called “ground itch”; pneumonia with eosinophilia Threadworm = Nausea, vomiting, diarrhea, iron deficiency anemia</p> Signup and view all the answers

Match the following parasites with their egg morphology:

<p>Ancylostoma = Oval; 56-75um long x 3640um wide; thin-shelled eggs Necator Americanus = Infertile ova measure up to 90um in length; fertile eggs are round measuring 75um in length and 50um in width Ascaris = Eggs are oval; 56-75um long x 3640um wide; thin-shelled eggs Strongyloides = Egg: oval; 56-75um long x 3640um wide; thin-shelled eggs and sometimes contains developing embryo</p> Signup and view all the answers

Match the intestinal nematode parasites with their adult worm morphology:

<p>Enterobius vermicularis = Adult: 35-50mm long for female; 30-45mm long for male, rarely found in stool Trichuris trichiura = No distinct adult worm morphology mentioned Ascaris lumbricoides = No distinct adult worm morphology mentioned Ancylostoma duodenale = Adult: 10-15mm long for female; 8-12mm long for male, rarely found in stool</p> Signup and view all the answers

Match the following parasites with their diagnostic methods:

<p>Ancylostoma = Eggs detection in stool sample; larvae examination in sputum specimen Necator Americanus = Eggs detection in stool sample; larvae examination in sputum specimen Ascaris = Stool exam; sputum exam or bronchial lavage for rhabditiform larvae Strongyloides = Eggs detection in stool sample; larvae examination in sputum specimen</p> Signup and view all the answers

Match the following parasitic infections with their treatment options:

<p>Hookworm infection = Mebendazole Ascariasis = Albendazole; Mebendazole Strongyloidiasis = Albendazole; Mebendazole Threadworm = Mebendazole; Albendazole</p> Signup and view all the answers

Study Notes

Nematodes

  • 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

  • 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

  • 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
  • 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
  • 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.

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