Parasitology: Strongyloides stercoralis Characteristics

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Questions and Answers

What is the size difference between Ancylostoma duodenale and Necator Americanus?

A. duodenale is slightly longer but thinner than N. americanus

A. duodenale is smaller and thinner than N. americanus

A. duodenale is thinner but longer than N. americanus

A. duodenale is larger and thicker than N. americanus (correct)

Which clinical manifestation is associated with Filariform larvae breaking through pulmonary capillaries and entering the alveoli?

Cutaneous larva migrans

Hypoalbuminemia

Bronchitis and bronchopneumonia (correct)

Ground itch

What is the common treatment for both Ancylostoma duodenale and Necator Americanus?

Mebendazole (correct)

Praziquantel

Ivermectin

Albendazole

How do the anterior ends of Ancylostoma duodenale and Necator Americanus differ?

A. duodenale bends in the opposite direction of the body curvature, while N. americanus bends in the same direction Signup and view all the answers

Which larval stage of Strongyloides stercoralis is commonly seen in stool specimens?

Rhabditiform larvae Signup and view all the answers

What diagnostic technique is recommended to demonstrate rhabditiform larvae in cases of Strongyloides infection?

Harada-Mori culture Signup and view all the answers

Which of the following is a common clinical manifestation of strongyloidiasis?

Perianal itching Signup and view all the answers

What is the recommended treatment for Strongyloides stercoralis infection?

Thiabendazole Signup and view all the answers

What distinguishes hookworm from Strongyloides based on larval characteristics?

Forked tail in hookworm Signup and view all the answers

What is the characteristic feature of filariform larvae of hookworms?

Pointed tail Signup and view all the answers

What is the mode of transmission of human pinworm (Enterobius vermicularis)?

Person-to-person transmission Signup and view all the answers

"Enterobiasis" refers to an infection caused by which parasite?

Enterobius vermicularis Signup and view all the answers

"Eggs on the perianal folds" is a diagnostic stage characteristic of which parasite?

Enterobius vermicularis Signup and view all the answers

Which diagnostic method is used to detect adult worms in cases of Enterobius vermicularis infection?

Nocturnal examination Signup and view all the answers

Which of the following is a common symptom of hookworm infection in humans?

Blood-streaked diarrhea Signup and view all the answers

What is the diagnostic stage used for lab diagnosis of hookworm infection?

Unsegmented ovum Signup and view all the answers

Which type of hookworm tends to occur in cooler and drier regions?

Necator americanus Signup and view all the answers

What is the treatment for hookworm infection in humans?

Oral administration of mebendazole Signup and view all the answers

Which diagnostic method is used to demonstrate eggs in the feces for hookworm infection?

FECT examination Signup and view all the answers

What is a common clinical manifestation of hookworm infection?

Rectal bleeding with abdominal cramps Signup and view all the answers

Which parasite is responsible for causing hookworm infection in wild and domestic dogs and cats?

Ancylostoma caninum Signup and view all the answers

What does the diagnostic stage look like in a hookworm ovum?

'Barrel-shaped with protruding mucous plug at each pole' Signup and view all the answers

'Rectal relapse' is associated with which parasitic infection?

Trichuris trichiura Signup and view all the answers

What is a key feature of the ova for Ascaris lumbricoides?

'Surrounded by a thick, transparent shell' Signup and view all the answers

What is the mode of transmission for Trichuris trichiura?

Skin penetration Signup and view all the answers

Study Notes

Hookworms

Ancylostoma duodenale is larger than Necator Americanus
Filariform larvae breaking through pulmonary capillaries and entering the alveoli can cause coughing, chest pain, and hemoptysis
Both Ancylostoma duodenale and Necator Americanus are treated with mebendazole, albendazole, or pyrantel pamoate
Ancylostoma duodenale has a distinctive buccal capsule, while Necator Americanus has a mouth with four pairs of teeth

Strongyloides

The rhabditiform larval stage of Strongyloides stercoralis is commonly seen in stool specimens
The diagnostic technique recommended to demonstrate rhabditiform larvae is the Baermann apparatus or agar plate method
A common clinical manifestation of strongyloidiasis is bronchospasm, and in severe cases, it can cause respiratory failure
The recommended treatment for Strongyloides stercoralis infection is ivermectin or thiabendazole
Hookworms can be distinguished from Strongyloides based on larval characteristics, with hookworms having a longer and more slender body
The characteristic feature of filariform larvae of hookworms is their ability to break through pulmonary capillaries and enter the alveoli

Enterobius Vermicularis

Enterobiasis is an infection caused by the parasite Enterobius vermicularis
The mode of transmission of human pinworm is through ingestion of eggs contaminated with feces
The diagnostic stage characteristic of Enterobius vermicularis is the presence of eggs on the perianal folds
The diagnostic method used to detect adult worms in cases of Enterobius vermicularis infection is the Scotch tape test
A common symptom of Enterobius vermicularis infection is pruritus ani

Hookworm Infection

A common symptom of hookworm infection in humans is abdominal pain and diarrhea
The diagnostic stage used for lab diagnosis of hookworm infection is the egg stage
The type of hookworm that tends to occur in cooler and drier regions is Ancylostoma duodenale
The treatment for hookworm infection in humans is mebendazole, albendazole, or pyrantel pamoate
The diagnostic method used to demonstrate eggs in the feces for hookworm infection is the Kato-Katz technique
A common clinical manifestation of hookworm infection is iron deficiency anemia and protein malnutrition
The parasite responsible for causing hookworm infection in wild and domestic dogs and cats is Ancylostoma braziliense and Ancylostoma caninum
The diagnostic stage of a hookworm ovum has a characteristic plug-like structure at one end
Rectal relapse is associated with Strongyloides stercoralis infection

Ascaris and Trichuris

A key feature of the ova for Ascaris lumbricoides is the presence of a thick, mammillated shell
The mode of transmission for Trichuris trichiura is through ingestion of eggs contaminated with feces

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Description

Learn about the characteristics and diagnostic stages of Strongyloides stercoralis, a parasitic nematode commonly seen in stool specimens. Understand its morphology, life cycle, and associated clinical conditions.