2019年广州市花都区流感样病例及病毒型别监测分析报告

Surveillance and analysis on influenza cases and virus types in Huadu District of Guangzhou City in 2019

目的了解2019年广州市花都区流感样病例(influenza-like illness,ILI)流行病学特征及病原学特点,为今后疫情防控提供参考。方法收集2019年广州市花都区流感样病例及病毒型别数据,采用描述性流行病学方法分析病例及病原分布。结果2019年全区哨点医院门诊流感样病例占门诊病例百分比(ILI%)为6.49%,高于2018年(4.97%),低于2017年(7.32%)。2019年全区共报告流感样病例暴发疫情45起,多于2018年(32起)。涉疫单位分别为:小学35起(占77.78%),幼儿园、中学各5起(各占11.11%),以小学为主。全区10个街镇中8个有疫情报告,其中以新华街和狮岭镇最多。45起暴发疫情中,A(H3N2)型流感病毒30起,B(Victoria)型流感病毒7起,A(H1N1)型流感病毒4起,共同感染1起,未定性3起。2019年共采集流感样病例呼吸道标本519份,阳性267份,阳性率为51.45%,低于2018年(56.87%),高于2017年(45.80%)。阳性标本中,188份为A(H3N2)型流感病毒(占70.41%),57份为B(Victoria)型流感病毒(占21.35%),22份为A(H1N1)pdm09型流感病毒(占8.24%)。2019年送检标本阳性以A(H3N2)型流感病毒为主。结论学校是防控流感的重点场所,加强学校等学龄儿童聚集场所的监测,可有效防止暴发疫情的发生。

Objective To provide reference for future epidemic prevention and control by analyzing epidemiological and etiological characteristics of influenza-like illness(ILI)cases in Huadu District of Guangzhou City in 2019.Methods The data of ILI cases and virus types were collected in Huadu District of Guangzhou City in 2019,and descriptive epidemiological method was applied to analyze the distribution of cases and pathogens.Results The percentage of ILI cases(ILI%)from outpatient clinics of sentinel hospitals in the whole district was 6.49%,and it was higher than that in 2018(4.97%)and lower than that in 2017(7.32%).A total of outbreak epidemics of 45 ILI cases were reported in 2019,being higher than that in 2018(32 cases),The organizations involved in the epidemics involved primary school with 35 cases(accounting for 77.78%)as well as kindergarten and middle school with 5 cases respectively(accounting for 11.11%respectively),and the primary school dominated.The epidemics were reported in 8 out of 10 streets and towns across the district,of which Xinhua Street and Shiling Town were reported to have the most cases.In 45 cases of epidemic outbreak,30 cases were caused by influenza A(H3 N2)virus,7 cases were caused by influenza B(Victoria)virus,4 cases were caused by influenza A(H1 N1)virus,1 case was co-infected,and 3 cases were uncertain.A total of 519 respiratory tract specimens of ILI were collected in 2019,and 267 cases were positive with a positive rate of 51.45%,which was lower than that in 2018(56.87%)and higher than that in 2017(45.80%).In the positive samples,there were 188 samples with influenza A(H3 N2)virus(70.41%),57 cases with influenza B(Victoria)virus(21.35%),and 22 cases with influenza A(H1 N1)pdm09 virus(8.24%).Influenza A(H3 N2)virus dominated among main positive samples in 2019.Conclusion The school is considered to be key place for prevention and control of influenza,and intensification on monitoring work of school-age children gathering places can effectively prevent the occurrence of outbreak epidemic.