For each diagnostic procedure, select the most appropriate laboratory result. 58

Question

For each diagnostic procedure, select the most appropriate laboratory result.

58. _____ Differentiation of Group D enterococci from Group D non-enterococci.

59. _____ Differentiation of Streptococcus agalactiae from other streptococci.

60. _____ Identification of S. aureus.

61. _____ Screening of pathogenic enteric gram-negative rods.

62. _____ Differentiation of Streptococcus pyogenes from other streptococci.

(A) Inhibition of growth by bacitracin
(B) Fermentation of lactose
(C) Production of CAMP factor
(D) Growth in 6.5% salt broth
(E) Agglutination with anti-protein A antibodies

Explanation / Answer

For each diagnostic procedure, select the most appropriate laboratory result

58. Salt-Tolerence test is differentiates gram positive cocci (Enterococci are gram-positiv, enterococci were considered salt-tolerant group D streptococci) that grow in 6.5% NaCl from those that can not withstand this salt concentration.

61. Fermentation of lactose procedure in MacConkey agar is important in screening for enteric pathogens because most enteric pathogens do not ferment lactose.

62. The Bacitracin Inhibition Test differentiates Streptococcus pyogenes, Group A streptococci from other beta hemolytic streptococci.

58. _____ Differentiation of Group D enterococci from Group D non-enterococci. (D) Growth in 6.5% salt broth 59. _____ Differentiation of Streptococcus agalactiae from other streptococci. (C) Production of CAMP factor 60. _____ Identification of S. aureus. (E) Agglutination with anti-protein A antibodies 61. _____ Screening of pathogenic enteric gram-negative rods. (B) Fermentation of lactose 62. _____ Differentiation of Streptococcus pyogenes from other streptococci. (A) Inhibition of growth by bacitracin

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