Confirmed Case

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

Probable Case

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

Suspect Case

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

Definition of clinical illness

• Clinical illness is characterized by diarrhea, fever, nausea, cramps, and tenesmus. Asymptomatic infections may occur.