181. It is true regarding Endemic typhus that:
1. Man is the only reservoir of infection
2. Flea is a vector of the disease
3. The rash developing into eschar is a characteristic presentation
4. Culture of the etiological agent in tissue culture is diagnostic modality
Ans. -2
-haemolytic colonies. On Gram staining these were gram positive cocci. In the screening test for identification, the suspected pathogen is likely to be susceptible to the following agent:a182. An infant had high grade fever and respiratory distress at the time of presentation to the emergency room. The sample collected for blood culture was subsequently positive showing growth of
1. Bacitracin
2. Novobiocin
3. Optochin
4. Oxacillin
Ans. -4
183. A patient admitted to an ICU is on central venous line for the last one week. He is on ceftazidime and amikachin. After 7 days of antibiotics he develops a spike of fever and his blood culture is positive for gram positive cocci in chains, which are catalase negative. Following this, vancomycin was started but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is:
1. Staphylococcus aurenus
2. Viridans streptococci
3. Enterococcus faecalis
4. Coagulase negative Staphlococcus
Ans. 3?
184. In the gut, anaerobic bacteria outnumber the aerobes by a ratio of :
1. 10:1
2. 100:1
3. 1000:1
4. 10,000:1
Ans. 3?
185. With reference to Bacteroides fragills the following statements are true, except:
1. B. fragilis is the most frequent anaerobe isolated from clinical samples
2. B. fragills is not uniformly sensitive to metronidazole
3. The lipopolysaccharide formed by B. fragilis is structurally and functionally different from the conventional endotoxin
4. Shock and disseminated intravascular coagulation are common in Bacteroides
bacteremia
Ans. -*
186. The following statements are true regarding leptospirosis, except:
1. It is a zoonosis
2. Man is the dead end host
3. Man is an accidental host
4. Lice act as reservoirs of infection
Ans. ?
187. The single most common cause of pyrexia of unknown origin is:
1. Mycobacterium tuberculosis
2. Salmonella typhi
3. Brucella sp.
4. Salmonella paratyphi A.
Ans. 1
188. Salmonella typhi is the causative agent of typhoid fever. The infective does of S. typhi is:
1. One bacillus
2. 108 – 1010 bacilli
3. 102 - 105 bacilli
4. 1 – 10 bacilli
Ans. 4?
189. The mechanisms by which cholera might be maintained during the intervals between peak cholera seasons is :
1. Carrier status in animals
2. Carrier status in man
3. An environmental reservoir
4. Continuous transmission in man
Ans. -*
190. The endotoxin of the following gram-negative bacteria does not play any part in the pathogenesis of the natural disease:
1. Escherichia coli
2. Klebsiella sp.
3. Vibrio cholerae
4. Pseudomonas aeruginosa
Ans. -*
1. Man is the only reservoir of infection
2. Flea is a vector of the disease
3. The rash developing into eschar is a characteristic presentation
4. Culture of the etiological agent in tissue culture is diagnostic modality
Ans. -2
-haemolytic colonies. On Gram staining these were gram positive cocci. In the screening test for identification, the suspected pathogen is likely to be susceptible to the following agent:a182. An infant had high grade fever and respiratory distress at the time of presentation to the emergency room. The sample collected for blood culture was subsequently positive showing growth of
1. Bacitracin
2. Novobiocin
3. Optochin
4. Oxacillin
Ans. -4
183. A patient admitted to an ICU is on central venous line for the last one week. He is on ceftazidime and amikachin. After 7 days of antibiotics he develops a spike of fever and his blood culture is positive for gram positive cocci in chains, which are catalase negative. Following this, vancomycin was started but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is:
1. Staphylococcus aurenus
2. Viridans streptococci
3. Enterococcus faecalis
4. Coagulase negative Staphlococcus
Ans. 3?
184. In the gut, anaerobic bacteria outnumber the aerobes by a ratio of :
1. 10:1
2. 100:1
3. 1000:1
4. 10,000:1
Ans. 3?
185. With reference to Bacteroides fragills the following statements are true, except:
1. B. fragilis is the most frequent anaerobe isolated from clinical samples
2. B. fragills is not uniformly sensitive to metronidazole
3. The lipopolysaccharide formed by B. fragilis is structurally and functionally different from the conventional endotoxin
4. Shock and disseminated intravascular coagulation are common in Bacteroides
bacteremia
Ans. -*
186. The following statements are true regarding leptospirosis, except:
1. It is a zoonosis
2. Man is the dead end host
3. Man is an accidental host
4. Lice act as reservoirs of infection
Ans. ?
187. The single most common cause of pyrexia of unknown origin is:
1. Mycobacterium tuberculosis
2. Salmonella typhi
3. Brucella sp.
4. Salmonella paratyphi A.
Ans. 1
188. Salmonella typhi is the causative agent of typhoid fever. The infective does of S. typhi is:
1. One bacillus
2. 108 – 1010 bacilli
3. 102 - 105 bacilli
4. 1 – 10 bacilli
Ans. 4?
189. The mechanisms by which cholera might be maintained during the intervals between peak cholera seasons is :
1. Carrier status in animals
2. Carrier status in man
3. An environmental reservoir
4. Continuous transmission in man
Ans. -*
190. The endotoxin of the following gram-negative bacteria does not play any part in the pathogenesis of the natural disease:
1. Escherichia coli
2. Klebsiella sp.
3. Vibrio cholerae
4. Pseudomonas aeruginosa
Ans. -*
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