24. of below, which oneisthe MoST frequent bacterial cause ef the org listed pha

Question

24. of below, which oneisthe MoST frequent bacterial cause ef the org listed pharyngitis? A. S aureus B. S pneumoniae C. pyogenes D. N meningitides E. B. burgdorferi 25. Corynebacterium diphtheriae is a gram positive rod that does not form endospores. A. True B. False 26. Chlamydia trachomatis may cause non-gonococcal urethritis and conjunctivitis. True B. False 27. Brucella is only transmitted from human to human A. True B. False 28. Clostridium perfringens is an anaerobic nism that causes gas gangrene. A. True B. False 29. In cases of lepromatous leprosy, large numbers of microorganisms are typically seen in acid-fast stain smears. A. True B. False 30. A culture of skin lesions from a patient with pyoderma (impetigo) shows numerous colonies surrounded by a zone of beta hemolysis on a blood agar plate. A Gram stained smear shows gram positive cocci. If you found the catalase test to be negative, which one of the following organisms would you MOST likely have isolated? A. Streptococcus pyogenes B. Staphylococcus aureus C. Staphylococcus epidermidis D. Streptococcus pneumonia E. Streptococcus bovis 31. Which are the smallest independent living organisms? A. Shigella B. Fusobacteria C. Mycoplasma D. Spirochetes E. Mycobacteria

Explanation / Answer

24) The correct option is S.pneumoniae
Pharyngitis is inflammation of the pharynx, and is usually caused by streptococcal species.

25) The statement is true.
Corynebacterium diphtheriae are Gram-positive, nonmotile, rod-shaped bacteria that do not form spores or branch.

26) The statement is true.
Non-gonococcal urethritis and conjunctivitis are caused by clamydia trachomatis.

27) The statement is false.
Brucella (causative agent of Brucellosis) can also be transmitted to humans via inhalation of the organism or by direct contact with infected animal secretions.

28) The statement is true.
Clostridium perfringens is a condition caused by the production of toxic gases post surgeries, or during infection. It can turn the tissue necrotic.

29) The statement is true.
Skin smears or biopsy material that show acid-fast bacilli with the Ziel-Neelsen stain or the Fite stain can diagnose multibacillary leprosy

30) The correct option is Streptococcus pyogenes.
S.pyogenes showns beta haemolysis, is gram positive, catalase negative and can cause infection in Pyoderma

31) The correct option is Mycoplasma.
They have sizes varying from 0.15 to 0.3 µm in diameter.

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