Surveillance Population

Participating ABCs Areas

Total Population: approximately 45.5 million

U.S. map highlights areas participating in ABCs surveillance.

Map shows U.S. areas included in the ABCs population. See the matrix below for details.

Surveillance Areas/Isolate Collection

The total population of Active Bacterial Core surveillance (ABCs) for invasive disease is approximately 45.5 million. However, most states further restrict the population for certain pathogens to ensure complete reporting. The table below summarizes the population under surveillance and isolate collection for each pathogen and state as of October 2022. Unless otherwise noted, surveillance is statewide. ABCs sites collect isolates for all cases included in surveillance areas, except where indicated (*) as different in the table below.

Print-friendly version – Surveillance Population Matrix [2 pages]

Surveillance Population Matrix, 1997–2023 [105 pages]

ABCs Isolates Sent by Surveillance Areas, 1997–2023 [5 pages]

 

Active Bacterial Core Surveillance Matrix by State and Pathogen
State Neisseria meningitidis Haemophilus influenzae group B streptococcus group A streptococcus Streptococcus pneumoniae
CA 3,625,170
(3 county Bay area)
3,625,170
(3 county Bay area)
3,625,170
(3 county Bay area)
3,625,170
(3 county Bay area)
3,625,170
(3 county Bay area)
CO 2,837,074
(5 county Denver area)
2,837,074
(5 county Denver area)
2,837,074
(5 county Denver area)
2,837,074
(5 county Denver area)
2,837,074
(5 county Denver area)
CT 3,605,597 3,605,597 3,605,597

*Isolates only collected for cases < 1 year old

3,605,597 3,605,597
GA 10,799,566 10,799,566 5,952,372
(all ages, 20 county Atlanta area) and 54,315 (<1 years outside 20 county metro)
Total: 6,006,687
5,952,372
(20 county Atlanta area)
5,952,372
(20 county Atlanta area)
MD 6,165,129 6,165,129 6,165,129 2,787,529
(6 county Baltimore area)
2,787,529
(6 county Baltimore area)
MN 5,707,390 5,707,390 5,707,390 5,707,390 5,707,390
NM 2,115,877 2,115,877 2,115,877 2,115,877 2,115,877
NY 2,201,947
(7 county Rochester area and 8 county Albany area)
2,201,947
(7 county Rochester area and 8 county Albany area)
2,201,947
(7 county Rochester area and 8 county Albany area)
*Isolates only collected for cases <90 days old
2,201,947
(7 county Rochester area and 8 county Albany area)
2,201,947
(7 county Rochester area and 8 county Albany area) and 49,840 (<5 years in Erie county)
Total: 2,251,787
OR 4,246,155 4,246,155 1,826,725
(3 county Portland area)
1,826,725
(3 county Portland area)
1,826,725
(3 county Portland area)
TN 4,239,105
(20 urban counties)
4,239,105
(20 urban counties)
4,239,105
(20 urban counties)
*Isolates not collected
4,239,105
(20 urban counties)
4,239,105
(20 urban counties)
Total 45,543,010 45,543,010 38,330,701 34,898,786 34,948,626

CDC retrieved populations from the Census Bureau’s Vintage 2021 Population Estimates.

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