# Giardia duodenalis outbreak — Maryland, 2011-07
> **Water** · Confirmed · 21 ill / 0 hosp / 0 deaths
## Outbreak
- **NORS ID:** NORS-291274d8d7cd
- **Date:** 2011-07
- **State:** Maryland
- **Primary mode:** Water
- **Etiology:** Giardia duodenalis (unknown)
- **Etiology status:** Confirmed
- **Setting:** Fee-based facility/membership club
## Impact
- **Illnesses:** 21
- **Hospitalizations:** 0
- **Deaths:** 0
## Water exposure

- **Exposure:** Recreational water -- treated
- **Water type:** Pool - Other Swimming Pool

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