TABLE.
Waterborne disease outbreaks associated with environmental and undetermined water exposures* (n = 18), by state or jurisdiction and month of first case onset — Waterborne Disease and Outbreak Surveillance System, United States, 2011–2012
| Exposure state/ Jurisdiction | Month | Year | Etiology† | Predominant illness§ | No. cases | No. hospitalizations¶ | No. deaths** | Water source | Setting |
|---|---|---|---|---|---|---|---|---|---|
| Colorado | May | 2011 | Giardia intestinalis | AGI | 2 | 0 | 0 | River/Stream | Camp/Cabin |
| Florida | Oct | 2011 | L. pneumophila serogroup 1 | ARI | 3 | 3 | 1 | Ornamental fountain | Mobile home park |
| Florida | Nov | 2012 | L. pneumophila | ARI | 2 | 2 | 0 | Undetermined | Hotel/Motel/Lodge/Inn |
| Idaho | Feb | 2012 | Giardia intestinalis | AGI | 4 | 0 | 0 | River/Stream | National forest |
| Illinois | Jul | 2012 | L. pneumophila serogroup 1 | ARI | 114 | 15 | 3 | Ornamental fountain | Hotel/Motel/Lodge/Inn |
| Illinois | Aug | 2012 | Legionella suspected†† | ARI | 56 | 0 | 0 | Ornamental fountain | Hotel/Motel/Lodge/Inn |
| Massachusetts | Sep | 2011 | L. pneumophila serogroup 1 | ARI | 2 | 2 | 0 | Undetermined | Indoor Workplace/Office |
| New York | Jul | 2011 | L. pneumophila serogroup 1 | ARI | 5 | 4 | 1 | Cooling tower | Hospital/Health care |
| New York | Jul | 2011 | L. pneumophila serogroup 1 | ARI | 2 | 2 | 1 | Undetermined | Hospital/Health care |
| Ohio | Jan | 2010§§ | L. pneumophila serogroup 1 | ARI | 4 | 4 | 1 | Undetermined | Hospital/Health care |
| Ohio | Jul | 2011 | L. pneumophila serogroup 1 | ARI | 3 | 3 | 1 | Undetermined | Hospital/Health care |
| Ohio | Sep | 2011 | L. pneumophila serogroup 1 | ARI | 5 | 5 | 1 | Undetermined | Other¶¶ |
| Ohio | Feb | 2012 | L. pneumophila serogroup 1 | ARI | 8 | 8 | 2 | Undetermined | Long-term care facility |
| Ohio | Nov | 2012 | L. pneumophila serogroup 1 | ARI | 7 | 3 | 0 | Undetermined | Long-term care facility |
| Pennsylvania | Aug | 2011 | L. pneumophila serogroup 1 | ARI | 8 | 4 | 0 | Undetermined | Long-term care facility |
| Pennsylvania | Jul | 2012 | L. pneumophila serogroup 1 | ARI | 34 | 11 | 0 | Undetermined (Multiple) | Hotel/Motel/Lodge/Inn |
| Utah | Nov | 2011 | Giardia intestinalis | AGI | 20 | 0 | 0 | River/Stream | Public outdoor area |
| West Virginia | Jun | 2011 | L. pneumophila serogroup 1 | ARI | 3 | 3 | 0 | Undetermined | Resort |
| Wisconsin | May | 2012 | L. pneumophila serogroup 1 | ARI | 2 | 2 | 0 | Storage tank | Factory/Industrial facility |
Abbreviations: AGI = acute gastrointestinal illness; ARI = acute respiratory illness; L. pneumophila = Legionella pneumophila; other = undefined, illnesses, conditions, or symptoms that cannot be categorized as gastrointestinal, respiratory, ear-related, eye-related, skin-related, neurologic, hepatitis, or caused by leptospirosis.
The environmental and undetermined category includes outbreaks not associated with drinking water systems (public, private or bottled water) or recreational water venues (e.g., swimming pools, lakes), and includes outbreaks epidemiologically linked to multiple water sources and outbreaks without a specific implicated water source.
Etiologies listed are confirmed, unless indicated “suspected”; for multiple-etiology outbreaks, etiologies are listed in alphabetical order.
The category of illness reported by =50% of ill respondents; all legionellosis outbreaks were categorized as ARI.
Value was set to “missing” in reports where zero hospitalizations were reported and the number of people for whom information was available was also zero.
Outbreak of Pontiac Fever; Legionella pneumophila serogroup 1 found in water sample.
The first case of illness in this outbreak occurred before 2011, but the outbreak was reported later and not previously described in a surveillance report.
Multiuse facility serving individuals with disabilities.