# Leptospira interrogans;Leptospira unknown outbreak — Illinois, 1991-07
> **Water** · Suspected;Confirmed · 6 ill / 4 hosp / 0 deaths
## Outbreak
- **NORS ID:** NORS-05f8b6b90809
- **Date:** 1991-07
- **State:** Illinois
- **Primary mode:** Water
- **Etiology:** Leptospira interrogans;Leptospira unknown
- **Etiology status:** Suspected;Confirmed
- **Setting:** Outdoor Area
## Impact
- **Illnesses:** 6
- **Hospitalizations:** 4
- **Deaths:** 0
## Water exposure

- **Exposure:** Recreational water -- untreated
- **Water type:** Lake/Reservoir

## Source
- [NORS Dashboard](https://wwwn.cdc.gov/norsdashboard/)
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