# Legionella unknown outbreak — Montana, 1991-03
> **Water** · Confirmed · 4 ill / 0 hosp / 0 deaths
## Outbreak
- **NORS ID:** NORS-e09e8fe3a879
- **Date:** 1991-03
- **State:** Montana
- **Primary mode:** Water
- **Etiology:** Legionella unknown
- **Etiology status:** Confirmed
- **Setting:** Resort;Hotel/motel
## Impact
- **Illnesses:** 4
- **Hospitalizations:** 0
- **Deaths:** 0
## Water exposure

- **Exposure:** Recreational water -- treated
- **Water type:** Hot Tub/Spa/Whirlpool

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