On Gram stain, which organism appears thin in the center and thicker at the ends?

Question

Quizplus · Accepted Answer

Chryseobacterium spp., E.meningoseptica, and the CDC group IIb are medium-to-long straight rods and often appear as "II forms" (i.e., cells that appear thin in the center and thicker at the ends).E.brevis varies in being short-to-long rods.Agrobacterium yellow group is slender, medium-to-long gram-negative rods.The CDC groups EO-3 and EO-4 are coccobacilli, and the CDC groups O-1, O-2, and O-3 are short gram-negative curved rods.

On Gram Stain, Which Organism Appears Thin in the Center