Active Bacterial Core surveillance (ABCs) Haemophilus influenzae

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>
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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病例定义以及用于计算美国每年各细菌的发病率及估计数的具体方法。随着时间的推移，监控区域、实验室分离菌株收集区域以及处理缺失数据的方法均有所变化。特别是，从2010年起，数据缺失的处理方式由基于已知病例值的未知值分配转变为采用多个插补法的顺序回归插补方法。鉴于这些变化，对趋势的解释应持谨慎态度。
<ul>
<li><a href="http://www.cdc.gov/abcs/methodology/index.html">方法学</a> - 查询关于监控人群、病例确定、监控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> - 获取基于ABCs数据的报告和出版物中的官方解读。</li>
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