Este test está cronometrado.
Tienes 20 minutos para completar 20 preguntas de este test.
Which of the following correctly describes Staph epidermidis?
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
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:
Clostridium perfringes type A toxin
Coagulase from Staph aureus
Staph aureus enterotoxin
Penicillinase given to inactivate penicillin in the meat
Quellung test is used for identification of:
Pneumococci
Streptococci
H influenza
Klebseilla
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:
E coli
Staph epidermidis
Staph aureus
Enterococcus fecalis
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?
Strept pyogens
Pseudomonus
Neisseria gonorrhea
Active immunization against diptherira :
Subunit vaccine
Aluminium precipitated toxoid
Antitoxin serum
Killed vaccine
Which of the following is true about Listeria monocytogens?
Pathogenic to man only
Gram positive spore forming bacilli
Tumbling motility at 37 degree
Has a capsule
Transmitted by contaminated milk
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?
Non hemolytic on blood
Exotoxin producing
Treated by penicillin
Has polysaccharide capsule
Spore forming
Pathogenicity of B.anthracis is due to:
Endotoxin
Ig A protease
A-B exotoxin
C5a peptidase
Immunity against Listeria monocytogens is mainly:
Humoral
Cell mediated
Innate
Ig A mediated
Pseudomembranous colitis is mailnly diagnosed by:
Toxin in blood
Organism from stool
Gram stained film
Toxin in stool by cytotoxic effect on cell culture
Pathogenesis of which of the following includes retrograde axonal transport?
Cl.tetani
Cl.botulinium
C.diphtheria
B.anthracis
Rapid test for diagnosis of gas gangrene:
Culture on blood agar
Nagler reaction
Sugar fermentation
Elek test
Which is not capsulated?
Salmonella
Shigella
E.coli
Diagnostic titer of Enteric fever in widal test :
1/80
1/40
1/160
1/320
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:
Activating acetylcholine estrase
Inhibiting elongation factor 2
Producing hemolysin
Increasing CAMP
Gullian Barre syndrome is a complication of:
H.pylori
Campylobacter
Cholera
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:
Halophilic, sucrose positive, produces heat labile cytotoxin
Halophilic, sucrose negative, produces heat stable cytotoxin
Optimum growth at 42
Reservoir is cattle and birds
Diagnostic titer in Brucella:
The main component of H.influenza type B vaccine :
Toxoid
Mutant strain
Whole cell killed vaccine
Polysaccharide capsule with protein carrier