ABCs Report: Legionellosis, 2015

February 27, 2018: 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 37,689,744 persons.
Source: National Center for Health Statistics bridged race vintage 2015 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 2015.

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 2015. 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 2015 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 319 (1.7)
Female 222 (1.2)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by race
Race No. (Rate*)
White 381 (1.4)
Black 148 (2.3)
Other 13 (0.4)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by age
Age (years) Cases
No. (Rate*)
Deaths
No. (Rate*)
< 10 8 (0.17) 0 (0.00)
10-19 3 (0.06) 0 (0.00)
20-29 16 (0.31) 0 (0.00)
30-39 37 (0.72) 1 (0.02)
40-49 62 (1.25) 5 (0.10)
50-59 124 (2.35) 7 (0.13)
60-69 148 (3.60) 6 (0.15)
70-79 79 (3.67) 11 (0.51)
≥ 80 65 (4.83) 8 (0.59)
Total 542 (1.44) 38 (0.10)

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

Reported ABCs Profiles by site
Site Cases
No. (Rate*)
Deaths
No. (Rate*)
California** 30 (0.83) 2 (0.06)
Colorado** 54 (2.01) 3 (0.11)
Connecticut 56 (1.56) 3 (0.08)
Georgia** 46 (1.15) 4 (0.10)
Maryland 147 (2.45) 8 (0.13)
Minnesota 50 (0.91) 9 (0.16)
New Mexico 16 (0.77) 0 (0.00)
New York** 70 (3.21) 6 (0.28)
Oregon 49 (1.22) 4 (0.07)
Tennessee** 24 (0.60) 0 (0.00)
Total 542 (1.44) 38 (0.10)

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

Reported ABCs Profiles by methodology
Testing Methodology No. (%)
Urine Antigen 513 (94.6)
Culture 39 (7.2)
Serology 4 (0.7)

Note: Some cases had more than one testing method

Reported ABCs Profiles by severity
Illness Severity No. (%)
Hospitalization 520 (95.9)
ICU admission 212 (39.1)
Mechanical ventilation 98 (18.1)
Death 38 (7.0)

National Estimates of Disease

Cases: 4,564 (1.42/100,000)
Deaths: 334 (0.10/100,000)

Citation

Centers for Disease Control and Prevention. 2017. Active Bacterial Core Surveillance Report, Emerging Infections Program Network, Legionellosis, 2015.

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