四川省2003年1～6月流感爆发的因素

A STUDY ON THE FACTORS OF INFLUENZA OUTBREAK FROM JANUARY TO JUNE IN 2003 IN SICHUAN PROVINCE.

目的 :探讨引起四川省流感爆发的因素以便制定防治措施。方法 :应用描述流行病学方法对四川省 2 0 0 3年 1～ 6月流感爆发疫情进行分析。结果 :1～ 6月共发生了 2 6起流感局部爆发累计发病 316 6人 ,从 2 0 3份病人咽拭子中分离出2株 A 3型、 10株 B型流感毒株 ,采集病人双份血清 5 5份中有 2 0份对 A3型有 4倍增长 ;发病高峰主要集中在 5月 ,1～ 6月平均罹患率 18.85 %。其中 2 3起发生在中小学校 ,且以农村中小学校为主 ,发病年龄主要集中在 5～ 14年龄组 ,占总发病人数的 78.2 4 % ,2 0 0 3年的发病数较去年同期增加了 6 4 .96 %。结论 :引起该省 1～ 6月流感局部爆发的流感病毒为 B型和 A3型。农村中小学校学生因卫生。

Objective:To investigate the factors of influenza outbreak and the ways of influenza prevention.Methods:All data of influenza outbreak occurred form January to June in 2003 in Sichuan was analyzed by descriptive epidemiology.Results:Totally 26 times and 3166 cases occurred form January to Jane were published in Sichuan .203 sample were collected. Two influenza type A3 and ten influenza type B viruses were isolated. 20 serum samples were 4 times increased for influenza type A3 among 55 double serum samples. Majority of influenza outbreak occurred in May, and the averagely attack rate was 18.85%. 23 times occurred in primary and middle schools, and 96.65% of the all focused in rural schools. Most cases (78.24%) occurred mainly in 5～14 years. the cases this year was increased 6496.00% compared with the same course last year.Conclusion:The main type aroused partly influenza outbreak from January to June was influenza type B and type A3 virus.Influenza outbreak occurred more easily because of lower immunity, poor health and short of housemates in rural schools.