Bacillus anthracis — Gram Stain
Large gram-positive spore-forming rods (1 to 1.5 by 3 to 5 microns) arranged in chains. Forms oval, central to subterminal spores that do not swell the bacterial cell. Spores are formed under atmospheric conditions. Spores are not present in clinical specimens.
|B. anthracis in long chain in blood.|
|B. anthracis from culture, long chains, no spores.|
|B. anthracis from culture. Single cells and short chains, few spores present.|