18 Questions
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:
Trichinella spiralis = Albendazole + steroids (for severe symptoms) Wuchereria bancrofti = Diethylcarbamazine Capillaria philippinensis = Albendazole Unspecified = Antiviral medications
Match the following parasites with their symptoms:
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
Match the following parasites with their egg morphology:
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
Match the intestinal nematode parasites with their mode of transmission:
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
Match the intestinal nematode parasites with their primary site of infection:
Enterobius vermicularis = Small intestines Trichuris trichiura = Cecum, colon Ascaris lumbricoides = Lumen of cecum; colon Ancylostoma duodenale = Lungs
Match the following parasitic infections with their primary mode of transmission:
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
Match the intestinal nematode parasites with their egg morphology:
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
Match the following parasites with their primary site of infestation:
Ancylostoma = Small intestines Necator Americanus = Lungs and small intestines Ascaris = Small intestines Strongyloides = Small intestines and lungs
Match the intestinal nematode parasites with their disease manifestations:
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
Match the intestinal nematode parasites with their treatment:
Enterobius vermicularis = Mebendazole; Albendazole Trichuris trichiura = Pyrantel pamoate Ascaris lumbricoides = Mebendazole Ancylostoma duodenale = Pyrantel pamoate; Mebendazole
Match the following parasitic infections with their characteristic manifestations:
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
Match the following parasites with their egg morphology:
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
Match the intestinal nematode parasites with their adult worm morphology:
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
Match the following parasites with their diagnostic methods:
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
Match the following parasitic infections with their treatment options:
Hookworm infection = Mebendazole Ascariasis = Albendazole; Mebendazole Strongyloidiasis = Albendazole; Mebendazole Threadworm = Mebendazole; Albendazole
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
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.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
