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Shigellosis (Shigella spp.)
2012 Case Definition

CSTE Position Statement(s)

  • 11-ID-19

Clinical Description

An illness of variable severity characterized by diarrhea, fever, nausea, cramps, and tenesmus. Asymptomatic infections may occur.

Laboratory Criteria for Diagnosis

Suspect: Detection of Shigella from a clinical specimen using a non-culture based method.

Confirmed: Isolation of Shigella from a clinical specimen.

Case Classification


A case that meets the suspect laboratory criteria for diagnosis.


A clinically compatible case that is epidemiologically linked, i.e., is a contact of a confirmed case or a member of a risk group defined by public health authorities during an outbreak.


A case that meets the confirmed laboratory criteria for diagnosis. When available, O antigen serotype characterization should be reported.


Both asymptomatic infections and infections at sites other than the gastrointestinal tract, if laboratory confirmed, are considered confirmed cases that should be reported