1. Modified Thayer-Martin selective medium for pathogenic Neisseria contains: a.
ID: 187148 • Letter: 1
Question
1. Modified Thayer-Martin selective medium for pathogenic Neisseria contains: a. vancomycin 3 ug/ml, colistin 7.5 ug/ml, nystatin 12.5 ug/ml and trimethoprim lactate 5 ug/ml b. vancomycin 4 ug/ml, colistin 7.5 ug/ml, trimethoprim lactate 5 ug/ml and anisomycin 20 ug/ml c. vancomycin 2 ug/ml, colistin 5.5 ug/ml, amphotericin 1.2 ug/ml and trimethoprim lactate 3 ug/ml d. vancomycin 4 ug/ml and colistin 5 ug/ml 2. The most important feature which distinguishes Staphylococcus epidermidis from staphylococcus aureus is its: a. inability to ferment mannitol b. inability to produce coagulase c. absence of beta hemolysis on blood agar d. sensitivity to high salt concentration 3. Streptococcus pneumoniae can be differentiated best from the viridans group of streptococci by: a. gram stain b. the type of hemolysis COlonial morphology d. bile solubility 4. In order to dete ct upper respiratory carriers of Haemophilus influenzae or Neisseria meningitidis what type of should be obtained for culture? specimen a. nasopharyngeal b. throat c. external nares d. soft palateExplanation / Answer
1. Answer A
Modified Thayer-Martin (MTM) agar is a GC agar base containing vancomycin 3ug/ml , colistin 7.5ug/ml, nystatin 12.5ug/ml, and trimethoprim lactate 5ug/ml (VCNT).
2. Answer D - Staphylococcus aureus are well known resistant to high-salt concentrations
S. aureus - ferment mannitol
S. aureus - coagulase test +ve
3. Answer D - Bile solubility - S. pneumoniae do Bile soluble
4. Answer B -Throat - upper respiratory tract specimens throat swab
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