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WEBSITE OF THE STATE OF SOUTH DAKOTA DEPARTMENT OF HEALTH
Kim Malsam-Rysdon, Interim Secretary of Health

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.

 

long chain B. anthracis in long chain in blood.
long chains, no spores B. anthracis from culture, long chains, no spores.
single cells, few spores B. anthracis from culture. Single cells and short chains, few spores present.
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