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

Yersinia pestis — Gram Stain

Gram-negative bacilli (0.5 to 0.8 by 1 to 3 microns), single or short chained. Sometimes bipolar staining (“closed safety pin”).

yersinia gram stain
Note: The safety pin appearance is best observed in direct smears of infected specimens. All bipolar staining cells are not Yersinia pestis.

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