The commensal Neisseria spp. are often confused with pathogenic gram-negative diplococci. A simple test utilizing a blood agar plate and an antibiotic disk resulting in elongation of the cells assists in the differentiation of these organisms. Which antibiotic disk is utilized in this applica-tion?
a. Cephalosporin
b. Vancomycin
c. Penicillin
d. Metronidazole
C
These organisms can be differentiated from true cocci by growth on a blood agar plate and placement of a 10-unit penicillin disk on the plate. Following incubation overnight, a Gram stain of the cells near the zone of inhibition will exhibit elongation; true cocci will not elongate.
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Fill in the blank(s) with the appropriate word(s).