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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.

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