Clinical Microbiology Stage Review Session #04

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Author:
inmyhouse
ID:
57947
Filename:
Clinical Microbiology Stage Review Session #04
Updated:
2011-01-03 21:06:24
Tags:
Micro
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Description:
Sputum, CSF & Blood, Mycology
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  1. True or False
    Tularemia
    is an arthropod-borne disease caused by Francisella tularensis, a Gram-negative, aerobic bacillus.
    True
  2. True or False
    Bacitracin susceptibility is a presumptive test for the identification of alpha-hemolytic streptococci.
    False. (It is used for beta-hemolytic streptococci.)
  3. True or False
    Dermatophyte fungi are all able to cause hair infections.
    False. (Dermatophyte fungi cause skin infections.)
  4. True or False
    Bordetella pertussis has fastidious growth requirements and usually
    requires 24 hours for growth in order for agglutination tests to be performed.
    False. (It requires at least 48 hrs for growth)
  5. True or False
    Brucellosis is a zoonotic infection which is also known as undulant fever.
    True
  6. True or False
    Pneumocysitis carinii is an opportunistic parasite infecting
    immunocompromised patients, such as those with AIDS.
    False. (it is an atypical fungus.)
  7. True or False
    Some Streptococcus species and Neisseria species may be part of the
    normal flora of the upper respiratory tract.
    True
  8. True or False
    Haemophilus influenzae, a possible cause of meningitis in infants, is a
    facultative anaerobe.
    True
  9. True or False
    The causative organism of scarlet fever is alpha-hemolytic and produces
    an erythrogenic toxin.
    • False. (It is beta-hemolytic.)
    • *Note: Scarlet fever is a disease caused by exotoxins released by Streptococcus pyogenes.
  10. True or False
    Trichophyton species may produce microconidia and Microsporum
    species may produce macroconidia.
    True
  11. True or False
    The Elek test is an agglutination reaction for the identification of
    Corynebacterium diphtheriae.
    False. (it is a precipitation test.)
  12. True or False
    Flavobacterium meningosepticum, implicated in nosocomial meningitis, is
    a Gram-negative bacillus that is catalase positive and has peritrichous
    flagella.
    False. (it is nonmotile.)
  13. True or False
    Burkholderia cepacia is a Gram-negative facultatively anaerobic
    opportunistic bacillus which infects the lungs of patients with cystic
    fibrosis.
    False. (It is an aerobic organism)
  14. True or False
    The heart muscle is the usual focus of infection with Corynebacterium
    diphtheriae in the body.
    False. (it is the throat.)
  15. True or False
    A species of Haemophilus showing no growth on blood agar, growth on
    blood agar with a Staph streak and growth on nutrient agar with a Staph
    streak could be Haemophilus parainfluenzae.
    • True
    • *Note: Haemophilus parainfluenzae needs only factor V (NAD) to grow.
  16. True or False
    Moraxella catarrhalis, a causative agent for pneumonia, is oxidase
    positive and produces acid from glucose, maltose, and sucrose.
    False. (it does not utilize these carbohydrates. ie. inert)
  17. True or False
    Sabouraud-dextrose agar has a low pH essential for the growth of fungi.
    False. (The low pH is required for inhibition of bacteria.)
  18. True or False
    Legionella pneumophila is a Gram-negative bacillus which can cause
    Legionnaire’s disease, an often fatal pneumonia, as well as Pontiac fever,
    a self-limiting, non-fatal, flu-like syndrome.
    True
  19. True or False
    Streptococcus pyogenes is associated with sub-acute bacterial endocarditis.
    False. (It is associated with acute bacterial endocarditis.)
  20. True or False
    Candida species can be found on fruits and vegetables, on skin, and in
    the genito-urinary tract.
    True
  21. True or False
    Bacillus anthracis is a Gram-positive, spore-forming bacillus which is catalase-positive, encapsulated, and exhibits characeristic tumbling
    motility at 36°C.
    False. (It is nonmotile)
  22. True or False
    Isolation of Enterococcus faecalis from a blood culture requires following up with protocols for investigating VRE.
    True
  23. True or False
    Borrelia recurrentis and Leptospira interrogans are spirochetes which
    can be present in blood cultures from patients infected by animal contact.
    True
  24. True or False
    Formation of a protein capsule is characteristic of Cryptococcus
    neoformans.
    False. (It has a carbohydrate capsule.)
  25. True or False
    Streptococcus pneumoniae is distinguished from the viridans group
    streptococci by optochin susceptibility and hemolytic reactions on blood agar.
    False. (The hemolytic reactions are identical ie. alpha hemolytic.)
  26. True or False
    Candida albicans incubated for 2 hours at 37°C in pooled serum produces pseudohyphae.
    False. (It produces germ tubes.)
  27. True or False
    Listeria monocytogenes and Streptococcus agalactiae both cause
    neonatal meningitis and are both Gram-positive cocci which are CAMP
    test positive and hydrolyze sodium hippurate.
    False. (Listeria monocytogenes is a gram positive bacillus.)
  28. True or False
    Urea hydrolysis is useful in the identification of Candida species.
    False. (It is useful in the identification of Cryptococcus species.)
  29. True or False
    Mycoplasma pneumoniae produces hydrogen peroxide, resulting in
    beta-hemolytic zones with greening of the periphery when these
    organisms are grown on blood agar.
    True
  30. True or False
    The organism usually associated with pigeon droppings in disease transmission is Candida tropicalis.
    False. (It is Cryptococcus neoformans.)

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