北京市2011-2016年肠道门诊腹泻患者中诺如病毒检出率的时间分布特征分析

Temporal distribution of norovirus infection among outpatients with diarrhea from 2011 to 2016 in Beijing of China

目的了解北京市肠道门诊腹泻患者中诺如病毒检出率的时间分布特征,为诺如病毒胃肠炎的防控提供依据。方法采用集中度与圆形分布法对北京市2011-2016年肠道门诊腹泻患者中诺如病毒检出率的时间分布特征进行分析,并结合北京市病原学检测结果判断新变异株的出现对诺如病毒检出率的影响。结果2011-2016年诺如病毒检出率集中度M=0.179。圆形分布分析结果为:高峰日在1月25日,高峰期为10月10日至次年5月12日。在新变异株出现的年度,诺如病毒检出率较高,集中度M>0.29,检出率高峰期小于6个月。而在没有新变异株出现的年度,诺如病毒检出率较低,集中度M<0.17,检出率高峰期大于7个月。结论冬春季北京市肠道门诊腹泻患者中诺如病毒检出率较高。新变异株出现的年份诺如病毒检出率的季节性更加明显。

Objective To understand the temporal distribution of norovirus infection among outpatients with diarrhea in Beijing,China. Methods Concentration degree and circular distribution methods were used to analyze the temporal distribution of norovirus infections among outpatients with diarrhea in Beijing from 2011 to 2016. Results Concentration degree analysis showed a M value of 0.179 with the detection rates of norovirus.The circular distribution analysis showed that the detection rate peaked at January 25 and the epidemic seasons were from October 10 to May 12 of the following year.During years with new variants emerged,the norovirus detection rates were higher,with the values of M〉0.29 and the peak time less than 6months.In the years without new strains emerging,the norovirus detection rates were lower,with the values of M〈0.17 and the peak time more than 7months. Conclusions The norovirus detection rates among outpatients with diarrhea showed a peak in winter and spring.In the years with new strains emerging,the norovirus detection rates were higher than that of years without new strains.