Home Products Most Popular Contact
No items in your cart.
The page below is a sample from the LabCE course Preliminary Identification of the Primary Select Agents of Bioterrorism. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Preliminary Identification of the Primary Select Agents of Bioterrorism (online CE course) »
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 129 CE courses, most popular
$95 Add to cart
Pick Your Courses
Up to 8 CE hours
$50 Add to cart
Individual course$20 Add to cart

Y. pestis image courtesy of CDC

Yersinia pestis

Clinical specimens where organism may be encountered:

  • Blood
  • Lymph node aspirate
  • Respiratory secretions

Gram stain morphology:

  • Gram-negative rod
  • Resembles other Enterobacteriaceae
  • Can form short chains
  • Gram stains performed from blood culture or other liquid media may show bipolar staining (displayed by the arrows)

Note: Use of Wright-Giemsa staining on direct specimen may enhance demonstration of characteristic bipolar staining, also referred to as "safety-pin" morphology. Use of this staining is of limited value, as the method is not very sensitive or specific.