Confirmed Case

• Laboratory confirmation of infection with or without symptoms: 
• Culture isolation of Yersinia spp. from an appropriate clinical specimen

Probable Case

• Laboratory evidence of infection with or without symptoms: 
  
• Detection of Yersinia spp. by PCR from an appropriate clinical specimen.

Suspect Case 

• Clinical illness in a person who is epidemiologically linked to a confirmed case.
  

Appropriate clinical specimens

• Appropriate clinical specimens include sterile site, deep tissue wounds, stool, vomit, urine, or blood.