广州地区1998-2003年儿童流行性感冒病毒监测结果分析

Epidemiological Monitoring of Influenza Viruses in Guangzhou Area from 1998 to 2003

目的研究1998-2003年广州地区儿童流感病毒(流感)感染的流行情况。方法对流感样症状的儿童取咽分泌物,接种到狗肾细胞(MDCK)上,在33℃温箱培养48-72h。MDCK细胞上清液进行血凝试验。结果3444例中264例分离出流感病毒,流感病毒分离总阳性率7.7%。1998、1999年流感阳性率分别为16.8%、7.4%,H3N2是强势株;2000年流感分离阳性率8.4%,出现H1N1亚型;2001年流感分离阳性率3馏%,未分离到H3N2亚型;2002年流感分离阳性率7.3%,B型流感病毒为强势株;2003年分离阳性率1.7%。1998-2001年广州地区儿童B型流感病毒流行为Yamagata型,2002-2003年流行为Victoria型。1999年发现禽流感H9N2亚型。结论1998年为流感流行较活跃年份,2001和2003年流感活动较平静;1998-2001年广州地区儿童B型流感流行Yamagata型,2002-2003年流行Victoria型。1999年发现儿童感染H9N2个案。

Objective To explore the epidemics of influenza viruses in Guangzhou area from 1998 to 2003. Methods The specimens for viral isolation were taken with swabs from children＇s throats and the material was inoculated into the MDCK cells and were incubated at 33℃. The supernatant of MDCK cells culture was tested with hemagglutination test. Results Influenza viruses were isolated from 264 of 3444 children; total positive rate of influenza virus isolation was 7.6%. The positive rate of influenza viruses was 16.8% in 1998; the prevailing strain of influenza viruses was H3N2. The influenza viruses isolation rate was 7.4% in 1999;the positive rate was 8.4 %; HINI occurred in 2000, the positive rate was 3.8 %. H3N2 did not occur in 2001 ; the positive rate was 7.3 % ; influenza B viruses was the prevailing strain in 2002; the positive rate was 1.7% in 2003. Influenza B viruses was Yamagata like strain from 1998 to 2001, Victoria like strain from 2002 to 2003. H9N2 avian influenza virus was isolated from a child. Conclusions Influenza was prevalent in Guangzhou in 1998, but not prevalent from 1999 to 2003. Most of influenza B viruses were Yamagata strain. There were cases avian influenza caused by H9N2 in 1999.