ABCs Report: Legionellosis, 2014

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 37,356,033 persons.
Source: National Center for Health Statistics bridged race vintage 2014 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 2014.

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 2014. 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 2014 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 350 (1.9)
Female 227 (1.2)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by race
Race No. (Rate*)
White 376 (1.4)
Black 192 (3.0)
Other 9 (0.3)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by age
Age (years) Cases
No. (Rate*)
Deaths
No. (Rate*)
< 10 1 (0.02) 0 (0.00)
10-19 1 (0.02) 0 (0.00)
20-29 21 (0.240) 0 (0.00)
30-39 38 (0.75) 0 (0.00)
40-49 68 (1.36) 0 (0.00)
50-59 153 (2.90) 5 (0.09)
60-69 129 (3.25) 15 (0.38)
70-79 99 (4.76) 10 (0.48)
≥ 80 67 (5.04) 12 (0.98)
Total 577 (1.54) 43 (0.12)

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

Reported ABCs Profiles by site
Site Cases
No. (Rate*)
Deaths
No. (Rate*)
California** 14 (0.39) 2 (0.06)
Colorado** 42 (1.59) 6 (0.23)
Connecticut 58 (1.61) 4 (0.11)
Georgia** 30 (0.76) 1 (0.03)
Maryland 145 (2.43) 10 (0.17)
Minnesota 58 (1.06) 1 (0.02)
New Mexico 9 (0.43) 0 (0.00)
New York** 88 (4.03) 12 (0.55)
Oregon 29 (0.73) 4 (0.10)
Tennessee** 104 (2.63) 3 (0.08)
Total 577 (1.54) 43 (0.12)

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

Reported ABCs Profiles by methodology
Testing Methodology No. (%)
Urine Antigen 545 (93.8)
Culture 44 (7.6)
Serology 4 (0.7)

Note: Some cases had more than one testing method

Reported ABCs Profilesby severity
Illness Severity No. (%)
Hospitalization 564 (97.1)
ICU admission 211 (36.3)
Mechanical ventilation 123 (21.2)
Death 44 (7.6)

National Estimates for Invasive Disease

Cases: 4,815 (1.51/100,000)
Deaths: 371 (0.12/100,000)

Citation

Centers for Disease Control and Prevention. 2017. Active Bacterial Core Surveillance Report, Emerging Infections Program Network, Legionellosis, 2014.

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Page last reviewed: May 17, 2017 (archived document)