# Giardia duodenalis outbreak — Colorado, 1978-03
> **Water** · Confirmed · 5000 ill / 0 hosp / 0 deaths
## Outbreak
- **NORS ID:** NORS-e3a0bb5fea90
- **Date:** 1978-03
- **State:** Colorado
- **Primary mode:** Water
- **Etiology:** Giardia duodenalis
- **Etiology status:** Confirmed
- **Setting:** Community/municipality
## Impact
- **Illnesses:** 5000
- **Hospitalizations:** 0
- **Deaths:** 0
## Water exposure

- **Exposure:** Drinking water
- **Water type:** Community

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