Suspect spore-forming, gram-positive Bacillus species that is c-hemolytic, nonmotile, and penicillin-susceptible and that produces a wide zone of lecithinase on egg yolk agar can be iden-tified as:
a. Corynebacterium diphtheria.
b. B. anthracis.
c. Bacillus cereus.
d. Corynebacterium jeikeium.
B
B. anthracis should be suspected if typical c-hemolytic "Medusa head" colonies are observed on 5% sheep blood agar and if the organism is subsequently found to be nonmotile and lecithi-nase-positive.
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