Differentiation of the pleomorphic strains of streptococci and the similar corynebacteria or lactobacilli can be best accomplished by:
a. examination of Gram stain of the colony.
b. vancomycin-susceptibility testing.
c. serologic testing.
d. examination of the morphologic features after growth in thioglycollate broth.
D
All the genera described in this chapter are gram-positive cocci. Microscopically, streptococci are round or oval-shaped, occasionally forming elongated cells that resemble pleomorphic cory-nebacteria or lactobacilli. Growth in broth should be used to determine its cellular morphologic structure if a question remains regarding the staining characteristics from solid media.
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