An illness of variable severity characterized by diarrhea, fever, nausea, cramps, and tenesmus. Asymptomatic infections may occur.
Supportive laboratory evidence: Detection of Shigella spp. or Shigella/EIEC from any clinical specimen using a culture-independent diagnostic test (CIDT). A CIDT is any diagnostic test that does not involve growing the bacteria (i.e., culture or isolate) in any type of diagnostic media (e.g., broth, agar, slant). Keywords indicating a CIDT was performed: “PCR,” “detected” or “positive.”
Confirmatory laboratory evidence: Isolation of Shigella from any clinical specimen. Keywords indicating isolation of Shigella: “isolated,” “growth,” “identified,” or “culture.”
A person linked by place and time to case with laboratory evidence of Shigella.
Confirmed
A case that meets the confirmed laboratory criteria.
Probable
A case should not be counted as a new case if laboratory results were reported within 90 days of a previously reported infection in the same individual.
When two or more different serotypes are identified in one or more specimens from the same individual, each should be reported as a separate case.
Both asymptomatic infections and infections at sites other than the gastrointestinal tract, if supported by laboratory evidence, are considered confirmed cases that should be reported.
For this disease/condition, Confirmed and Probable case statuses are included in the released case count.
N = This criterion is Necessary in conjunction with all other “N” and any “O” criteria in the same column is required to classify a case.
O = At least one of these “O” criteria in each category in the same column (e.g., clinical presentation and laboratory findings)—in conjunction with all other “N” criteria in the same column—is required to classify a case.
| Criterion for Shigellosis | Probable | Confirmed | |
|---|---|---|---|
| Clinical Evidence: | |||
| Diarrhea | N | ||
| Laboratory Findings: | |||
| Detection of Shigella spp. or Shigella/EIEC in a clinical specimen using a CIDT | N | ||
| Isolation of Shigella from a clinical specimen | N | ||
| Epidemiological Evidence: | |||
| Epidemiologically linked to a confirmed or probable case of shigellosis case with laboratory evidence | O | ||
| Member of a risk group as defined by EPI during an outbreak investigation | O | ||
| Criteria to distinguish a new case: | |||
| Not previously counted as a shigellosis infection in the same individual within 90 days, unless a different serogroup | N | N | |
Date Updated: