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Gram Negative
(Single Best Answer) Question 1: The sputum specimen of a 70 year old male was cultured on a 5 % sheep blood agar. The culture showed the presence of alpha - haemolytic colonies next day. The further processing of this organism is most likely to yield ?
A) Gram positive cocci in short chains, catalase negative and bile resistant
B) Gram positive cocci in pairs, catalase negative and bile soluble
C) Gram positive cocci in clusters, catalase positive and coagulase positive
D) Gram negative coccobacilli, catalase positive and oxidase positive
Answer (Select an option above to get the answer):
(Single Best Answer) Question 2: Which of the following is not true of gas gangrene ?
A) It is caused by Clostridium perfringens
B) Clostridium perfringens is a gram negative spore bearing bacillus
C) Gas gangrene is characterized by severe local pain, crepitus and signs of toxemia
D) High dose penicillin and aggressive debridement of affected tissue is the treatment of established infection
Answer (Select an option above to get the answer):
(Single Best Answer) Question 3: A 50 year old chronic alcoholic male agricultural worker presented with high grade fever of one week duration with spells of chills and rigor. Examination of the respiratory system revealed bilateral crepitations with scattered rhonchi. Multiple subcutaneous nodules were found on the extensor surface of the left forearm, arm and left leg. Direct microscopy of the pus aspirated from the skin nodule revealed plenty of Gram negative bacilli with bipolar staining. Culture revealed distinct rough corrugated grey-white colonies on Blood Agar. The organisms were motile and oxidase positive. The most likely diagnosis is ?
A) Plague
B) Melioidosis
C) Bartonellosis
D) Actinomycosis
Answer (Select an option above to get the answer):
(Single Best Answer) Question 4: The following statements are true regarding melioidosis except ?
A) It is caused by Burkholderia mallei
B) The agent is a gram negative aerobic bacteria
C) Bipolar staining of the aetiological agent is seen with methylene blue stain
D) The most common form of melioidosis is pulmonary infection
Answer (Select an option above to get the answer):
(Single Best Answer) Question 5: The most common pathogens responsible for nosocomial pneumonias in the ICU are ?
A) Gram positive organisms
B) Gram negative organisms
C) Mycoplasma
D) Virus infections
Answer (Select an option above to get the answer):
(Single Best Answer) Question 6: The most common pathogens responsible for nosocomial pneumonias in the ICU are ?
A) Gram positive organisms
B) Gram negative organisms
C) Mycoplasma
D) Virus infections
Answer (Select an option above to get the answer):
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