The most likely identification of an anaerobic, curved, gram-variable bacillus with tapered ends on Gram stain of vaginal secretions when vaginosis is suggested is:
a. Porphyromonas spp.
b. Actinomyces.
c. Mobiluncus.
d. Fusobacterium spp.
C
The genera Actinomyces, Bifidobacterium, Eubacterium, Eggerthella, Collinsella, anaerobic Lactobacillus, Atopobium, and Propionibacterium are among the anaerobic, gram-positive, non–spore-forming bacilli. Mobiluncus, a cause of bacterial vaginosis, is usually diagnosed on Gram stain of vaginal secretions by observation of gram-variable, curved rods with tapered ends. It is rarely isolated in the clinical laboratory because vaginal secretions are not acceptable speci-mens for anaerobic culture.
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