ABCs Report: Legionellosis, 2011
This webpage is archived for historical purposes and is no longer being maintained or updated.
May 17, 2017: Content on this page kept for historical reasons.
Active Bacterial Core Surveillance (ABCs): Emerging Infections Program Network
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ABCs Areas
California (3 county San Francisco Bay area); Colorado (5 county Denver area); Connecticut; Georgia (8 county Atlanta area); Maryland; Minnesota; New Mexico; New York (15 county Rochester and Albany areas); Oregon; Tennessee (20 urban counties)
ABCs Population
The surveillance areas represent 36,360,182 persons.
Source: National Center for Health Statistics bridged race vintage 2011 postcensal file
ABCs Case Definition
Confirmed legionellosis case: A positive culture of any Legionella organism from a body site, detection of L. pneumophila serogroup 1 antigen in urine, or fourfold or greater rise in specific serum antibody titer to L. pneumophila serogroup 1 between acute and convalescent sera in a resident of a surveillance area in 2011.
ABCs Methodology
ABCs personnel actively contacted all laboratories serving persons in the surveillance area to identify cases. Standardized case report forms that include information on demographic characteristics, clinical syndrome, and outcome of illness were completed for each identified case. Regular laboratory audits assessed completeness of active surveillance and detected additional cases.
All rates of legionellosis were calculated using population estimates for 2011. For national estimates of cases, race and age specific rates of disease were applied from the aggregate surveillance area to the age and racial distribution of the 2011 U.S. population. Cases with unknown race were distributed by site based on reported race distribution for known cases within the nine age categories.¶
Reported ABCs Profiles
Sex | No. | (Rate*) |
---|---|---|
Male | 302 | (1.7) |
Female | 180 | (1.0) |
* Cases per 100,000 population for ABCs areas
Race | No. | (Rate*) |
---|---|---|
White | 351 | (1.3) |
Black | 126 | (2.1) |
Other | 5 | (0.2) |
* Cases per 100,000 population for ABCs areas
Age (years) | Cases No. (Rate*) |
Deaths No. (Rate*) |
---|---|---|
< 10 | 0 (0.00) | 0 (0.00) |
10-19 | 0 (0.00) | 0 (0.00) |
20-29 | 8 (0.21) | 0 (0.00) |
30-39 | 27 (0.44) | 1 (0.02) |
40-49 | 74 (1.53) | 6 (0.11) |
50-59 | 130 (2.60) | 12 (0.23) |
60-69 | 103 (3.24) | 8 (0.23) |
70-79 | 72 (4.17) | 7 (0.38) |
≥ 80 | 68 (4.47) | 12 (0.93) |
Total | 482 (1.40) | 46 (0.13) |
*Cases or deaths per 100,000 population for ABCs areas
Site | Cases No. (Rate*) |
Deaths No. (Rate*) |
---|---|---|
California** | 11 (0.32) | 3 (0.09) |
Colorado** | 29 (1.17) | 3 (0.19) |
Connecticut | 82 (2.29) | 6 (0.14) |
Georgia** | 24 (0.64) | 1 (0.13) |
Maryland | 142 (2.44) | 11 (0.20) |
Minnesota | 28 (0.52) | 4 (0.06) |
New Mexico | 12 (0.58) | 2 (0.00) |
New York** | 90 (4.14) | 11 (0.28) |
Oregon | 22 (0.57) | 2 (0.00) |
Tennessee** | 42 (1.10) | 3 (0.05) |
Total | 482 (1.33) | 46 (0.13) |
* Cases or deaths per 100,000 population for ABCs areas
** Data from select counties
Testing Methodology | No. | (%) |
---|---|---|
Urine Antigen | 465 | (95.7) |
Culture | 48 | (9.8) |
Serology | 4 | (0.8) |
Note: Some cases had more than one testing method
Illness Severity | No. | (%) |
---|---|---|
Hospitalization | 476 | (97.9) |
ICU admission | 187 | (38.5) |
Mechanical ventilation | 130 | (26.8) |
Death | 47 | (9.7) |
National Estimates for Invasive Disease
Cases: 4,108 (1.32/100,000)
Deaths: 402 (0.13/100,000)
Citation
Centers for Disease Control and Prevention. 2017. Active Bacterial Core Surveillance Report, Emerging Infections Program Network, Legionellosis, 2011.
- Page last reviewed: May 17, 2017 (archived document)
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