The most likely identification of an anaerobic, curved, gram-variable bacillus with tapered ends on Gram stain of vaginal secretions when vaginosis is suspected is

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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 specimens for anaerobic culture.

The Most Likely Identification of an Anaerobic, Curved, Gram-Variable Bacillus