Active Bacterial Core Surveillance
ABCS is an active laboratory- and population-based surveillance system for invasive bacterial pathogens of public health importance. For each case of invasive disease in the surveillance population, a case report is completed and bacterial isolates are sent to CDC and other reference laboratories for additional laboratory evaluation. Currently, ABCs conducts surveillance for 6 pathogens: group A and Group B Streptococcus, Haemophilus influenzae, Neisseria meningitidis, and methicillin-resistant Staphylococcus aureus (MRSA). ABCs currently operates in 10 Emerging Infections Programs (EIP) sites across the U.S., representing a population of approximately 41 million. Most areas restrict the population to certain pathogens to ensure complete reporting and good audit data. National estimates of cases, disease rates, and deaths are calculated from these data.
http://www.cdc.gov/abcs/index.htm and related web pages.