Surveillance Areas and Population

Key points

  • 10 states participate in the Emerging Infections Program (EIP) and Active Bacterial Core surveillance (ABCs) network.
  • EIP is a collaboration between CDC, state health departments, and universities.
  • The total population of ABCs for invasive disease is approximately 45.5 million.
U.S. map highlights 10 areas participating in ABCs surveillance: entire states of Connecticut, Georgia, Maryland, Minnesota, New Mexico and Oregon as well as specific areas within California, Colorado, New York and Tennessee.

Participating state health departments and partners

State health department

State partners

  • Public Health Foundation Enterprises, Inc.
  • University of CA at Berkeley

State health department

State partner

Department of Preventive Medicine, University of Colorado Health Sciences Center

State health department

State partner

Yale University School of Medicine

State health department

State partners

  • Emory University Department of Medicine, Division of Infectious Diseases
  • Atlanta Veterans Affairs Medical Center

State health department

State partner

Johns Hopkins Bloomberg School of Public Health

State health department

State partner

Association for Professionals in Infection Control and Epidemiology, Inc. (APIC)

State health department

State partner

University of New Mexico Health Sciences Center

State health department

New York State Department of Health

State partner

  • Monroe County Health Department
  • University of Rochester School of Medicine and Dentistry

State health department

State partner

  • Oregon Health and Science University
  • Oregon & Southern Washington-Association for Professionals in Infection Control and Epidemiology

State health department

State partner

Vanderbilt University School of Medicine

Surveillance population and isolate collection

The total population of 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.

View the documents below for all years of ABCs surveillance populations and isolates sent by surveillance area.

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

This table is also available in a print-friendly version: Surveillance Population Matrix [2 pages]

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Content Source:
National Center for Immunization and Respiratory Diseases; Division of Bacterial Diseases