Laboratory | South Dakota Department 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”). 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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