ABCs Report: Legionellosis, 2012

September 5, 2014: 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 36,704,650 persons.

Source: National Center for Health Statistics bridged-race vintage 2012 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 2012.

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 2012 from the bridged-race vintage 2012 postcensal file. 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 2012 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

Reported ABCs Profiles
Sex No. (Rate*)
Male 256 (1.4)
Female 136 (0.7)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profilesby race, number, and rate
Race No. (Rate*)
White 292 (1.0)
Black 92 (1.5)
Other 10 (0.3)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by age, cases, and deaths
Age (years) Cases
No. (Rate*)
Deaths
No. (Rate*)
< 10 0 (0.00) 0 (0.00)
10-19 2 (0.04) 0 (0.00)
20-29 3 (0.06) 0 (0.00)
30-39 17 (0.35) 0 (0.00)
40-49 46 (0.89) 9 (0.17)
50-59 111 (2.14) 4 (0.08)
60-69 88 (2.38) 5 (0.14)
70-79 72 (3.80) 7 (0.37)
≥ 80 55 (4.21) 16 (1.23)
Total 394 (1.07) 39 (0.11)

*Cases or deaths per 100,000 population for ABCs areas

Reported ABCs Profiles by site, cases, and deaths
Site Cases
No. (Rate*)
Deaths
No. (Rate*)
California** 10 (0.29) 1 (0.03)
Colorado** 16 (0.63) 3 (0.12)
Connecticut 58 (1.62) 8 (0.22)
Georgia** 20 (0.52) 1 (0.03)
Maryland 117 (1.99) 12 (0.20)
Minnesota 51 (0.95) 3 (0.06)
New Mexico 9 (0.43) 0 (0.00)
New York** 65 (2.98) 7 (0.32)
Oregon 21 (0.54) 2 (0.05)
Tennessee** 27 (0.70) 4 (0.10)
Total 394 (1.07) 41 (0.11)

* Cases or deaths per 100,000 population for ABCs areas
** Data from select counties

Reported ABCs Profiles by methodology
Testing Methodology No. (%)
Urine Antigen 373 (94.7)
Culture 43 (10.9)
Serology 0 (0.0)

Note: Some cases had more than one testing method

Reported ABCs Profiles by severity
Illness Severity No. (%)
Hospitalization 382 (97.0)
ICU admission 161 (40.9)
Mechanical ventilation 86 (21.8)
Death 41 (10.4)

National Estimates for Invasive Disease

Cases: 3,362 (1.1/100,000)
Deaths: 335 (0.11/100,000)

Citation

Centers for Disease Control and Prevention. 2014. Active Bacterial Core Surveillance Report, Emerging Infections Program Network, Legionellosis, 2012.

Page last reviewed: September 5, 2014 (archived document)