Population vaccination coverage - Hib / Men C booster (5 years old) - WMCA

Children for whom the local authority is responsible who received a booster dose of Hib/MenC vaccine at any time by their fifth birthday as a percentage of all children whose fifth birthday falls within the time period

Rationale
The Hib / MenC booster increases the protection a child gets from the first course of Hib vaccine when they are 8, 12 and 16 weeks old, and the MenC vaccine when they are 12 and 16 weeks. This boosted immunity lasts into adulthood.
Vaccination coverage is the best indicator of the level of protection a population will have against vaccine preventable communicable diseases. Coverage is closely correlated with levels of disease. Monitoring coverage identifies possible drops in immunity before levels of disease rise.
Previous evidence shows that highlighting vaccination programmes encourages improvements in uptake levels. May also have relevance for NICE guidance PH21: Reducing differences in the uptake of immunisations (The guidance aims to increase immunisation uptake among those aged under 19 years from groups where uptake is low).

Definition of numerator
Total number of children whose fifth birthday falls within the time period who received a booster dose of Hib/MenC at any time before their fifth birthday. Data for 2013/14 are available at source at LA level. Data prior to 2013/14 were collected at PCT level and converted to LA level using the criteria as described in the notes section below.

Definition of denominator
Total number of children whose fifth birthday falls within the time period. Data from 2013/14 are available at source at LA level. Data prior to 2013/14 were collected at PCT level and converted to LA level using the criteria as described in the notes section below.

Caveats
None

本数据集统计受地方当局监护的儿童中，在其第五个生日前任一时刻接种B型流感嗜血杆菌/C群脑膜炎球菌（Hib/MenC）联合加强疫苗的人数占同期所有第五个生日落在该统计时段内儿童总数的比例。

### 设计依据
B型流感嗜血杆菌/C群脑膜炎球菌（Hib/MenC）加强疫苗可增强儿童在8、12和16周龄时初次接种B型流感嗜血杆菌疫苗，以及12和16周龄时初次接种C群脑膜炎球菌疫苗所获得的免疫保护效果，该加强免疫的保护效力可维持至成年阶段。
疫苗接种覆盖率是评估人群针对疫苗可预防传染病免疫水平的最优指标，其与疾病流行程度高度相关。通过监测接种覆盖率，可在疾病流行水平上升前及时发现免疫水平的潜在下降趋势。
既往研究显示，宣传推广疫苗接种项目可有效提升疫苗接种率。本数据集同时可用于参考英国国家卫生与临床优化研究所（National Institute for Health and Care Excellence, NICE）发布的PH21号指南：《降低免疫接种率差异》，该指南旨在提升19岁以下低接种率群体的免疫接种覆盖率。

#### 分子定义
统计时段内第五个生日落在该时段内，且在第五个生日前任一时刻接种Hib/MenC加强疫苗的儿童总人数。2013/14财年的原始数据可从原始数据源中以地方当局（Local Authority, LA）为统计单元获取。2013/14财年之前的数据以初级保健信托（Primary Care Trust, PCT）为统计单元收集，后续按照下文注释部分所述标准转换为地方当局层级数据。

#### 分母定义
统计时段内第五个生日落在该时段内的儿童总人数。2013/14财年的原始数据可从原始数据源中以地方当局（Local Authority, LA）为统计单元获取。2013/14财年之前的数据以初级保健信托（Primary Care Trust, PCT）为统计单元收集，后续按照下文注释部分所述标准转换为地方当局层级数据。

#### 数据限制
无