A 25-year-old medical student presents with a ruptured appendix A peritoneal inf

Question

A 25-year-old medical student presents with a ruptured appendix A peritoneal infection develops, despite prompt removal of the organ and extensive flushing of the peritoneal cavity. An isolate from a pus culture reveals a gram-negative bacillus identified as Bacteroides fragilis. Anaerobic infection with B, fragilis is best characterized by which of the following? A. A black exudate in the wound B. A foul smelling discharge C. A heme-pigmented colony formation D. An exquisite susceptibility to penicillin E. severe neurologic symptoms A patient complains to his dentist about a draining lesion in the mouth. A Gram stain of the pus shows a few gram-positive cocci, leukocytes, and many-branched gram-positive rods. Branched yellow sulfur granules are observed by a microscope. Which of the following is the most likely cause of the disease? A. Actinomyces viscosus B. Actinomyces israelii C. Corynebacterium diphtheriae D. Propionibacterium acnes E. Staphylococcus aureus A clinically depressed farmer complains of extreme weakness, a daily raise and fall in fever, and night sweats. Small gram-negative rods are isolated from blood cultures after a 2-week incubation period. Which of the following organisms is the most likely etiologic agent? A. Brucella melitensis B. Campylobacter jejuni C. Francisella tularensis D. Salmonella enteritldis E. Serratia marcescens

Explanation / Answer

62. Bacteroides fragilis infections produces foul smell from the wound due to production of different organic acid by the bacteroides.

So the answer is: B. a foul smelling discharge.

63. Actinomyces israelli are branched gram positive rods that commonly cause infection in mouth and produces yellow sulfur granules.

So the answer is: B. Actinomyces israelli

65. Since the patient is suffering from undulated fever (daily rise and fall), so the most probablu causative agent is - Brucella melitensis.

So the answer is: A. Brucella melitensis.

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