Which organism is a Gram-positive bacillus that is catalase positive and displays V forms?

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Multiple Choice

Which organism is a Gram-positive bacillus that is catalase positive and displays V forms?

Think of organisms that are Gram-positive bacilli, catalase positive, and show distinctive V-shaped cell arrangements due to snapping division. Those diphtheroids—Corynebacterium and Propionibacterium—fit best. On Gram stain they appear as short rods that align in V or L shapes, a pattern often described for these bacteria. This makes them stand out from the others listed: Haemophilus ducreyi is a Gram-negative coccobacillus, Neisseria lactamica is a Gram-negative diplococcus, and Nocardia is a Gram-positive, branching filament that is weakly acid-fast rather than displaying V-shaped arrangements. So the best match is Corynebacterium or Propionibacterium.

Think of organisms that are Gram-positive bacilli, catalase positive, and show distinctive V-shaped cell arrangements due to snapping division. Those diphtheroids—Corynebacterium and Propionibacterium—fit best. On Gram stain they appear as short rods that align in V or L shapes, a pattern often described for these bacteria. This makes them stand out from the others listed: Haemophilus ducreyi is a Gram-negative coccobacillus, Neisseria lactamica is a Gram-negative diplococcus, and Nocardia is a Gram-positive, branching filament that is weakly acid-fast rather than displaying V-shaped arrangements. So the best match is Corynebacterium or Propionibacterium.

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