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ABCs Report: group A Streptococcus, 2007

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 (20 county Atlanta area); Maryland (6 county Baltimore area); Minnesota; New Mexico; New York (15 county Rochester and Albany areas); Oregon (3 county Portland area); Tennessee (11 urban counties)

ABCs Population

The surveillance areas represent 30,848,368 persons. Source: National Center for Health Statistics bridged-race vintage 2007 postcensal file

ABCs Case Definition

Invasive group A streptococcal disease: isolation of group A Streptococcus from a normally sterile site or from a wound culture accompanied by necrotizing fasciitis or streptococcal toxic shock syndrome in a resident of a surveillance area in 2007.

ABCs Methodology

ABCs personnel routinely contacted all microbiology laboratories serving acute care hospitals in their 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. Strains were emm-typed at CDC. Regular laboratory audits assessed completeness of active surveillance and detected additional cases.

All rates of invasive group A streptococcal disease were calculated using population estimates for 2007. 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 2007 U.S. population. Cases with unknown race were distributed by site based on reported race distribution for known cases within the eight age categories.

Reported ABCs Profiles

Race No. (Rate*)
White 840 (3.5)e
Black 221 (4.7)
Other 105 (4.7)

Unknown race (n=242) distributed amongst known

* Cases per 100,000 population for ABCs areas

Ethnicity No. (Rate*)
Hispanic 128 (3.5)
Non-Hispanic 445 ------
Unknown 593 ------

*Cases per 100,000 population for ABCs areas

Age (years) Cases
No. (Rate*)
Deaths
No. (Rate*)
<1 28 (6.44) 1 (0.23)
1 17 (3.96) 0 (0.00)
2-4 34 (2.70) 1 (0.08)
5-17 67 (1.24) 2 (0.04)
18-34 133 (1.89) 6 (0.09)
35-49 267 (3.73) 26 (0.36)
50-64 275 (4.89) 32 (0.57)
≥ 65 345 (9.87) 68 (1.95)
Total 1,166 (3.78) 136 (0.44)

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

ABCs Area* Most common emmtypes % of area
isolates
California 1, 83, 4, 12, 59, 22, 90 62.7
Colorado 1, 12, 28, 76, 5, 89, 4, 11, 118 74.2
Georgia 1, 12, 28, 3 56.1
Maryland 1, 28, 83, 3, 12, 2, 87, 89 71.3
Minnesota 1, 28, 12, 4 64.2
New Mexico 76, 1, 12, 83, 11, 75, 118, 89 78.3
New York 1, 12, 2, 28, 89 76.6
Oregon 1, 28, 75, 2, 12 79.4
Tennessee 1, 12, 89, 28, 3, 4 85.7
Total 1, 12, 28, 89, 76, 3, 4, 83 66.8

*Connecticut contributed cases but no isolates; typing is pending for California, Maryland, New Mexico.

Requires a minimum of 3 or more isolates and ≥ 5% of isolates typed

Syndrome No. (%)
Cellulitis 388 (33.3)
Necrotizing fasciitis 73 (6.3)
Pneumonia 142 (12.2)
Primary bacteremia 384 (32.9)
Streptococcal toxic shock 62 (5.3)

Note: Some cases had more than one syndrome.

Potentially preventable invasive group A streptococcal disease

During 2007, 4 cases (ages 10 months and 37, 49, and 54 years) of invasive group A streptococcal disease were detected in patients with varicella.

National Estimates of Invasive Disease

Cases: 11,400 (3.78/100,000)
Deaths: 1,350 (0.45/100,000)

Citation

Centers for Disease Control and Prevention. 2008. Active Bacterial Core Surveillance Report, Emerging Infections Program Network, Group A Streptococcus, 2007.

 

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