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Cocci and Bacilli

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Gram positive and negative cocci and bacilli
Marina Michail
Quiz by Marina Michail, updated more than 1 year ago
Marina Michail
Created by Marina Michail over 8 years ago
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Resource summary

Question 1

Question
Which of the following correctly describes Staph epidermidis?
Answer
  • susceptible to penicillin G
  • can cause UTI in catherized patients
  • likely to be in a biofilm on a central venous catheter surface
  • resistant to vancomycin
  • coagulase positive

Question 2

Question
A box of meat prepared by a person with a boil on his neck is left out of refrigerator. 3 persons became violently ill after eating the sandwiches. The most likely cause is:
Answer
  • Clostridium perfringes type A toxin
  • Coagulase from Staph aureus
  • Staph aureus enterotoxin
  • Penicillinase given to inactivate penicillin in the meat

Question 3

Question
Quellung test is used for identification of:
Answer
  • Pneumococci
  • Streptococci
  • H influenza
  • Klebseilla

Question 4

Question
A young man crashes his bicycle injuring one leg, bacteria from the wound and blood culture are isolated and identified. Osteomyelitis is diagnosed. The most common causative organism is:
Answer
  • E coli
  • Staph epidermidis
  • Staph aureus
  • Enterococcus fecalis

Question 5

Question
A 22 year old female presents with fever, right knee swelling . Her joint aspirate shows gram negative diplococci. What is the most common cause of the patient septic arthritis?
Answer
  • Staph aureus
  • Strept pyogens
  • Pseudomonus
  • Neisseria gonorrhea

Question 6

Question
Active immunization against diptherira :
Answer
  • Subunit vaccine
  • Aluminium precipitated toxoid
  • Antitoxin serum
  • Killed vaccine

Question 7

Question
Which of the following is true about Listeria monocytogens?
Answer
  • Pathogenic to man only
  • Gram positive spore forming bacilli
  • Tumbling motility at 37 degree
  • Has a capsule
  • Transmitted by contaminated milk

Question 8

Question
A 53 year old farmer has a circular lesion of black eschar surrounded by edema (malignant pustule). Gram stain shows gram positive bacilli in chains. Which is false about this organism?
Answer
  • Non hemolytic on blood
  • Exotoxin producing
  • Treated by penicillin
  • Has polysaccharide capsule
  • Spore forming

Question 9

Question
Pathogenicity of B.anthracis is due to:
Answer
  • Endotoxin
  • Ig A protease
  • A-B exotoxin
  • C5a peptidase

Question 10

Question
Immunity against Listeria monocytogens is mainly:
Answer
  • Humoral
  • Cell mediated
  • Innate
  • Ig A mediated

Question 11

Question
Pseudomembranous colitis is mailnly diagnosed by:
Answer
  • Toxin in blood
  • Organism from stool
  • Gram stained film
  • Toxin in stool by cytotoxic effect on cell culture

Question 12

Question
Pathogenesis of which of the following includes retrograde axonal transport?
Answer
  • Cl.tetani
  • Cl.botulinium
  • C.diphtheria
  • B.anthracis

Question 13

Question
Rapid test for diagnosis of gas gangrene:
Answer
  • Culture on blood agar
  • Nagler reaction
  • Sugar fermentation
  • Elek test

Question 14

Question
Which is not capsulated?
Answer
  • Salmonella
  • Shigella
  • Klebseilla
  • E.coli

Question 15

Question
Diagnostic titer of Enteric fever in widal test :
Answer
  • 1/80
  • 1/40
  • 1/160
  • 1/320

Question 16

Question
A gram negative, oxidase positive bacillus that can grow at 42 degree causes cough and greenish sputum on smoke inhalation produces a toxin that works by:
Answer
  • Activating acetylcholine estrase
  • Inhibiting elongation factor 2
  • Producing hemolysin
  • Increasing CAMP

Question 17

Question
Gullian Barre syndrome is a complication of:
Answer
  • Pseudomonus
  • H.pylori
  • Campylobacter
  • Cholera

Question 18

Question
A 63 year old man eats poorly cooked seafood (oysters). 24 hours later, he develops fever and bloody diarrhea. He is positive for curved rod bacteria which is:
Answer
  • Halophilic, sucrose positive, produces heat labile cytotoxin
  • Halophilic, sucrose negative, produces heat stable cytotoxin
  • Optimum growth at 42
  • Reservoir is cattle and birds

Question 19

Question
Diagnostic titer in Brucella:
Answer
  • 1/80
  • 1/160
  • 1/40
  • 1/320

Question 20

Question
The main component of H.influenza type B vaccine :
Answer
  • Toxoid
  • Mutant strain
  • Whole cell killed vaccine
  • Polysaccharide capsule with protein carrier
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