Best Infectious Diseases Objective Type Questions And Answers

31- Which of the following is true of Spontaneous bacterial peritonitis?
1) A survival rate of over 50% is expected at one year
2) Gentamicin is the treatment of choice
3) is characteristically caused by aerobic bacteria.
4) is diagnosed by culture of ascitic fluid.
5) is due to intestinal perforation
Answers-3

32- You are an occupational health physician and have been asked by an anxious employee about contraindications to pertussis immunisation. Which of the following is a contraindication?
1) Eczema
2) Cow's milk protein intolerance.
3) Fever to 39.5°C following the first dose.
4) Redness of >2.5cm at the injection site after the first dose.
5) Hydrocephalus
Answers-3

33- The antibiotic combination Quinipristin and Dalfopristin are
1) effective against resistant mycobacterium TB.
2) indicated in subjects with chronic renal impairment.
3) particularly effective in the treatment of pseudomonas infection in Cystic fibrosis.
4) administered orally.
5) Effective against multi-resistant Staph Aureus
Answers-5

34- Which of the following is the commonest cause of traveller's diarrhoea?
1) E. Coli
2) Entamoeba Histolytica
3) Giardia Lamblia
4) Shigella Flexneri
5) Yersinia enterocolitica
Answers-1

35- Which of the following is true concerning Whooping cough (pertussis)?
1) is a greater threat to children during the second 6 months of life, after maternal antibody has declined, than during the first 6 months
2) may lead to hemiplegia
3) is characteristically associated with a polymorph leucocytosis
4) is associated with convulsions less frequently than is the case with other febrile conditions
5) rapidly resolves with antibiotic treatment
Answers-2

36- A 30 year old renal transplant recipient presented with non-Hodgkin's lymphoma.
Which virus is most likely to be of aetiological significance?
1) Adenovirus
2) Cytomegalovirus
3) Epstein Barr virus
4) Herpes simplex type 1
5) Varicella-zoster
Answers-3

37- A 49-year-old man with a long history of alcoholism presents with cough, haemoptysis and pleuritic chest pain. He has had night sweats and 10 kg weight loss in the last three months. On chest X-ray tgere is a subtle nodular pattern throughout the lung.
He underwent a transbronchial biopsy which showed multinucleated giant cells, epithelioid cells and necrotic debris.
Which of the following is the most likely diagnosis?
1) Aspergillosis
2) Pneumocystis carinii pneumonia
3) Small cell carcinoma
4) Squamous cell carcinoma
5) Tuberculosis
Answers-5

38- Which of the following concerning IgG is correct?
1) It has a molecular weight of 50,000 kd.
2) It is monovalent.
3) It comprises the majority of circulating antibody in serum.
4) It differs from other isotypes in not being able to cross the placental barrier.
5) It is the major antibody produced during the primary response.
Answers-3

39- Four members of a football team develop diarrhoea due to Salmonella enteritidis. Eating which food was the most likely source of the infection?
1) chicken at a fast food outlet 20 hours earlier
2) fried rice at a takeaway 4 hours earlier
3) raw eggs in milk 6 hours earlier
4) raw oysters at a hotel 24 hours earlier
5) soft cheeses 48 hours earlier
Answers-1

40- A 68-year-old man has been very ill for months following the onset of chronic liver disease with hepatitis C infection. He experiences a sudden loss of consciousness and then exhibits paraplegia on the right. A cerebral angiogram reveals lack of perfusion in the left middle cerebral artery distribution. The most likely cardiac lesion to be associated with this finding is?
1) Acute rheumatic fever
2) Left atrial myxoma
3) Libman-Sacks endocarditis
4) Non-bacterial thrombotic endocarditis
5) Paradoxical thromboembolus
Answers-4

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