ABCs Report: Legionellosis, 2013

October 19, 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 37,009,638 persons.

Source: National Center for Health Statistics bridged race vintage 2013 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 2013.

ABCs Methodology

ABCs personnel are in contact with 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.

All rates of legionellosis were calculated using population estimates for 2013. 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 2013 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 339 (1.9)
Female 178 (0.9)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by race
Race No. (Rate*)
White 362 (1.3)
Black 150 (2.5)
Other 5 (0.2)

* Cases per 100,000 population for ABCs areas

Reported ABCs Profiles by age
Age (years) Cases
No. (Rate*)
Deaths
No. (Rate*)
< 10 2 (0.04) 0 (0.00)
10-19 2 (0.04) 0 (0.00)
20-29 11 (0.21) 0 (0.00)
30-39 22 (0.44) 0 (0.00)
40-49 78 (1.53) 2 (0.04)
50-59 136 (2.60) 8 (0.15)
60-69 124 (3.24) 13 (0.34)
70-79 83 (4.17) 11 (0.55)
≥ 80 59 (4.47) 7 (00.53)
Total 517 (1.40) 41 (0.11)

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

Reported ABCs Profiles by site
Site Cases
No. (Rate*)
Deaths
No. (Rate*)
California** 16 (0.46) 3 (0.09)
Colorado** 31 (1.20) 5 (0.19)
Connecticut 65 (1.81) 5 (0.14)
Georgia** 31 (0.80) 5 (0.13)
Maryland 140 (2.36) 12 (0.20)
Minnesota 50 (0.92) 3 (0.06)
New Mexico 10 (0.48) 0 (0.00)
New York** 105 (4.81) 6 (0.28)
Oregon 18 (0.46) 0 (0.00)
Tennessee** 51 (1.30) 2 (0.05)
Total 517 (1.40) 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 497 (96.1)
Culture 50 (9.7)
Serology 0 (0.0)

Note: Some cases had more than one testing method

Reported ABCs Profiles by severity
Illness Severity No. (%)
Hospitalization 514 (99.4)
ICU admission 229 (44.3)
Mechanical ventilation 132 (25.5)
Death 41 (7.9)

National Estimates for Invasive Disease

Cases: 4,358 (1.38/100,000)
Deaths: 356  (0.11/100,000)

Citation

Centers for Disease Control and Prevention. 2015. Active Bacterial Core Surveillance Report, Emerging Infections Program Network, Legionellosis, 2013.

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Page last reviewed: October 19, 2015 (archived document)