Schistosoma Life Cycle and Habitat
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Questions and Answers

What is the typical location of S.haematobium in the host?

  • Intestinal walls
  • Vessels of the bladder (correct)
  • Spleen
  • Blood vessels lining the liver

How long do female Schistosoma worms typically produce eggs after host infection?

  • 1-2 years
  • 25-30 days (correct)
  • 1-2 weeks
  • 3-6 months

What is the primary site of egg production in Schistosoma?

  • Liver
  • Intestinal walls
  • Blood vessels (correct)
  • Urinary bladder

Which species of snail is suitable for S.japonicum infection?

<p>Oncomelania (D)</p> Signup and view all the answers

What is the approximate length of adult Schistosoma worms?

<p>10-20 mm (A)</p> Signup and view all the answers

What is the characteristic of the male Schistosoma worm?

<p>It has a canal in which the female resides (D)</p> Signup and view all the answers

What is the duration and severity of lesions dependent on in schistosoma infections?

<p>The length of cercaria stay in the dermis (D)</p> Signup and view all the answers

What is the mechanism of Katayama syndrome besides TH1 dominated response?

<p>Formation of immune-complexes with soluble schistosoma Ag (C)</p> Signup and view all the answers

What is the characteristic of Cercariae dermatitis?

<p>A temporary itchy maculopapular skin eruption (C)</p> Signup and view all the answers

What is the clinical feature of Katayama syndrome characterized by?

<p>Fever, arthralgia, and vasculitic skin eruption (A)</p> Signup and view all the answers

What is the name of the reaction that occurs 4-8 weeks after schistosoma infection?

<p>DTH reaction (C)</p> Signup and view all the answers

What is the result of the migration of parasites in bronchopneumonia?

<p>Radiologically demonstrable pulmonary infiltrates (A)</p> Signup and view all the answers

What is a characteristic feature of S.mansoni eggs in faeces?

<p>A lateral spine (D)</p> Signup and view all the answers

What is the primary goal of direct diagnosis in Schistosomiasis?

<p>To find the living eggs or miracidium (B)</p> Signup and view all the answers

What is a common symptom of cerebral dx caused by Schistosomiasis japonicum?

<p>Seizure (A)</p> Signup and view all the answers

Which of the following is NOT a differential diagnosis for Schistosomiasis?

<p>Meningitis (C)</p> Signup and view all the answers

What is the recommended time for collecting urine sediment for microscopy?

<p>Between 10 am - 2 pm (A)</p> Signup and view all the answers

What is the purpose of indirect diagnosis in Schistosomiasis?

<p>To detect circulating antischistosomal antibodies (C)</p> Signup and view all the answers

What is a possible manifestation of S. mansoni in the colon?

<p>Papilloma-like growth (B)</p> Signup and view all the answers

What occurs in Symmer's pipe-stem fibrosis?

<p>Gradual occlusion of intrahepatic portal veins (C)</p> Signup and view all the answers

Why is S. japonicum infection often more severe than S. mansoni infection?

<p>The granuloma formed is usually larger (C)</p> Signup and view all the answers

What is a possible neurological complication of schistosomiasis?

<p>Transverse myelitis (B)</p> Signup and view all the answers

What is Katayama fever?

<p>An initial illness caused by S. japonicum (B)</p> Signup and view all the answers

Where can ectopic worms be found in the CNS in heavy schistosomiasis infestation?

<p>Paravertebral venous plexus or cerebral cortical veins (B)</p> Signup and view all the answers

Which of the following is a characteristic of S.hematobium eggs?

<p>They have a terminal spine (C)</p> Signup and view all the answers

What is the main advantage of using Praziquantel in the treatment of Schistosomiasis?

<p>It is cheap and easy to administer (C)</p> Signup and view all the answers

What is the primary goal of health education in the prevention of Schistosomiasis?

<p>To reduce contact with contaminated water (B)</p> Signup and view all the answers

What is the characteristic of S.japonicum eggs?

<p>They have a lateral knob (C)</p> Signup and view all the answers

What is the main consequence of Schistosomiasis infection in the 13-year-old boy?

<p>All of the above (D)</p> Signup and view all the answers

What is the infectious form of Schistosoma?

<p>Fork-tailed cercaria (B)</p> Signup and view all the answers

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