30 Questions
What is the typical location of S.haematobium in the host?
Vessels of the bladder
How long do female Schistosoma worms typically produce eggs after host infection?
25-30 days
What is the primary site of egg production in Schistosoma?
Blood vessels
Which species of snail is suitable for S.japonicum infection?
Oncomelania
What is the approximate length of adult Schistosoma worms?
10-20 mm
What is the characteristic of the male Schistosoma worm?
It has a canal in which the female resides
What is the duration and severity of lesions dependent on in schistosoma infections?
The length of cercaria stay in the dermis
What is the mechanism of Katayama syndrome besides TH1 dominated response?
Formation of immune-complexes with soluble schistosoma Ag
What is the characteristic of Cercariae dermatitis?
A temporary itchy maculopapular skin eruption
What is the clinical feature of Katayama syndrome characterized by?
Fever, arthralgia, and vasculitic skin eruption
What is the name of the reaction that occurs 4-8 weeks after schistosoma infection?
DTH reaction
What is the result of the migration of parasites in bronchopneumonia?
Radiologically demonstrable pulmonary infiltrates
What is a characteristic feature of S.mansoni eggs in faeces?
A lateral spine
What is the primary goal of direct diagnosis in Schistosomiasis?
To find the living eggs or miracidium
What is a common symptom of cerebral dx caused by Schistosomiasis japonicum?
Seizure
Which of the following is NOT a differential diagnosis for Schistosomiasis?
Meningitis
What is the recommended time for collecting urine sediment for microscopy?
Between 10 am - 2 pm
What is the purpose of indirect diagnosis in Schistosomiasis?
To detect circulating antischistosomal antibodies
What is a possible manifestation of S. mansoni in the colon?
Papilloma-like growth
What occurs in Symmer's pipe-stem fibrosis?
Gradual occlusion of intrahepatic portal veins
Why is S. japonicum infection often more severe than S. mansoni infection?
The granuloma formed is usually larger
What is a possible neurological complication of schistosomiasis?
Transverse myelitis
What is Katayama fever?
An initial illness caused by S. japonicum
Where can ectopic worms be found in the CNS in heavy schistosomiasis infestation?
Paravertebral venous plexus or cerebral cortical veins
Which of the following is a characteristic of S.hematobium eggs?
They have a terminal spine
What is the main advantage of using Praziquantel in the treatment of Schistosomiasis?
It is cheap and easy to administer
What is the primary goal of health education in the prevention of Schistosomiasis?
To reduce contact with contaminated water
What is the characteristic of S.japonicum eggs?
They have a lateral knob
What is the main consequence of Schistosomiasis infection in the 13-year-old boy?
All of the above
What is the infectious form of Schistosoma?
Fork-tailed cercaria
This quiz covers the life cycle and habitat of Schistosoma japonicum and S. haematobium, including their residence in blood vessels and egg production.
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