Active Bacterial Core surveillance (ABCs) Group A Streptococcus

ABCs is an ongoing surveillance program that began in 1997. <a href="https://www.cdc.gov/abcs/reports-findings/surv-reports.html">ABCs reports</a> describe the ABCs case definition and the specific methodology used to calculate rates and estimated numbers in the United States for each bacterium by year. The methods, <a href="https://www.cdc.gov/abcs/methodology/surv-pop.html">surveillance areas</a>, and <a href="https://www.cdc.gov/abcs/methodology/surv-pop.html" >laboratory isolate collection areas</a> have changed over time.
Additionally, the way missing data are taken into account changed in 2010. It went from distributing unknown values based on known values of cases by site to use of multiple imputation using a sequential regression imputation method.
Given these changes over time, trends should be interpreted with caution.
<ul><li><a href="http://www.cdc.gov/abcs/methodology/index.html">Methodology</a>
Find details about surveillance population, case determination, surveillance evaluation, and more. </li> <li> <a href="http://www.cdc.gov/abcs/reports-findings/index.html">Reports and Findings</a>
Get official interpretations from reports and publications created from ABCs data.
</li> </ul>

ABCs项目是一项始于1997年的持续监控计划。ABCs报告详细阐述了ABCs病例定义以及计算美国每年每种细菌的发病率及估计数量的特定方法。随着时间的推移，监测区域、实验室分离株收集区域以及处理缺失数据的方法均有所变化。特别是，自2010年起，处理缺失数据的方法由基于已知病例值的未知值分布转变为采用序列回归插补的多种插补方法。鉴于这些随时间的变化，对趋势的解读应持谨慎态度。

<ul>
<li><a href="http://www.cdc.gov/abcs/methodology/index.html">方法学</a>
获取关于监测人群、病例确定、监测评估等方面的详细信息。</li>
<li> <a href="http://www.cdc.gov/abcs/reports-findings/index.html">报告与发现</a>
从ABCs数据生成的报告和出版物中获得官方解读。</li>
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