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      Influenza surveillance in Anqing, Anhui, 2014-2019

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          Abstract

          Objective To master the epidemiological pattern of influenza by analyzing influenza surveillance data in Anqing city during 2014-2019, and we provide scientific basis for the prevention and control of influenza.

          Methods Based on the "China Influenza Surveillance Information System", the data of sentinel surveillance and influenza outbreaks were collected and analyzed.

          Results The proportion of ILI% in Anqing City during 2014—2019 was 3.47%. There were significant differences in the proportion of ILI% in different years ( P<0.05). ILI was concentrated in the age group under 15 years old, accounting for 64.78%. Etiology positive rate of sentinel surveillance was 12.11%, the dominant strains were seasonal H3 and new A H1 viruses. There were significant differences in positive rate in different years ( P<0.05), ILI% positively correlated with etiology positive rate ( r=0.54, P<0.05). A total of 40 influenza outbreaks were reported, the dominant strains were type new A H1 and BV. There were significant differences in the positive rate in different seasons ( P<0.05); while no significant difference in the positive rate between urban and rural areas ( P>0.05) was found.

          Conclusion During 2014-2019, the incidence peak of influenza was in winter and summer in Anqing. The mixed epidemic of type A and B was dominant in winter and seasonal H3 subtype was dominant in summer. The outbreak mainly occurred in winter, mainly in primary schools. During 2014-2019, the seasonal H3, new A H1 and type BY became the dominant strain alternately.

          Abstract

          摘要: 目的 通过对 2014—2019 年度安庆市流感监测结果分析, 为防控提供依据。 方法 登录“中国流感监测信 息系统”, 对哨点监测数据和聚集性/暴发疫情数据进行统计分析。 结果 2014—2019 年度安庆市 ILI% 为 3.47%, 不同 年度 ILI% 差异有统计学意义 ( P<0.05), ILI集中在 15 岁以下年龄组, 占 64.78%。哨点监测病原学阳性率为 12.11%, 主 要为季H3和新甲H1型, 不同年度病原学阳性率的差异有统计学意义 ( P<0.05), ILI% 与病原学阳性率呈正相关 ( r = 0.54, P<0.05)。共报告 40 起聚集性/暴发疫情, 主要由新甲H1和BV型引起;不同季节阳性率的差异有统计学意义 ( P< 0.05) ;城市和乡村阳性率的差异无统计学意义 ( P>0.05)。 结论 2014—2019 年度安庆市流感活动呈现冬季和夏季 2 个高峰, 冬季为甲、乙型混合流行, 夏季为单一的季H3亚型。聚集性/暴发疫情主要发生在冬季, 以小学为主。2014—2019 年度, 季 H3、新甲 H1 和BY型交替或并列成为优势株。

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          Author and article information

          Journal
          CTM
          China Tropical Medicine
          China Tropical Medicine (China )
          1009-9727
          1 March 2020
          1 April 2020
          : 20
          : 3
          : 254-258
          Affiliations
          1Anqing Center for Disease Control and Prevention, Anqing, Anhui 246005, China
          Article
          j.cnki.46-1064/r.2020.03.13
          10.13604/j.cnki.46-1064/r.2020.03.13
          © 2020 Editorial Department of China Tropical Medicine

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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