[Guideline for the investigation of viral hepatitis A outbreak (version 2021)].

In China, the incidence rate of Hepatitis A has decreased from 56/100 000 in 1991 to 1.05/100 000 in 2020. The number of Hepatitis A outbreaks in China has decreased significantly, however, it has also happened in the last 5 years, and the risk still remains. In order to strengthen the technical guidance for the investigation and control of Hepatitis A outbreak, the Chinese Center for Disease Control and Prevention (China CDC) organized experts in related fields to compile this guideline. The main contents included outbreak definition, outbreak detecting and reporting, outbreak investigation and response, making conclusion and communication. This guideline is intended for use by staff at public health administrative departments, medical and health institutions, centers for disease control and prevention, health supervision agencies at different levels, and other relevant institutions, units and individuals. China CDC will update this guideline periodically based on the progress in this field and feedbacks during the implementation of this guideline.我国甲型肝炎报告发病率从1991年的56/10万下降到2020年的1.05/10万，甲型肝炎暴发数量较以前明显减少，但近5年也时有报道，仍存在风险。为加强对全国甲型肝炎暴发疫情调查处置和预防控制工作的技术指导，中国疾病预防控制中心组织相关领域专家，联合编写了本指南。本指南包括甲型肝炎暴发的监测和定义，甲型肝炎疫情的识别和报告，暴发疫情的规范调查和处置原则、调查结果的交流与反馈等。本指南适用于各级卫生行政部门、医疗保健机构、疾病预防控制机构、卫生监督机构以及相关集体、单位和个人。中国疾病预防控制中心将根据指南执行过程中反馈的问题和学科进展定期对指南进行修订。.