| Objectives:To analyze the epidemic characteristics of influenza of Jilin Province from two aspects of epidemiology and etiology in 2010-2015,and understand the epidemiological characteristics of influenza,the variability of predominant strains of influenza virus and the variability of influenza virus in Jilin Province.Methods:The influenza surveillance data and the virology surveillance data in Jilin Province from 2010 to 2015 were exported from China influenza surveillance information system.Excel 2003 software was used to count data and statistical SPSS20.0 software was used for statistical analysis.Discuss the epidemic distribution characteristics of influenza and etiology surveillance in Jilin Province from 2010 to2015.Results:1.199019 cases of influenza-like illness were reported by thirteen influenza surveillance sentinel hospitals in Jilin Province from 2010 to 2015,while the total number of outpatient and emergency clinic is 10944703.Influenza-like cases accounted for 1.82%.2.There were statistical differences in ILI% in different years(x~2=26374.933,P<0.001).The percentage of influenza-like cases accounted for emergency treatment rose in Jilin Province in 2010-2014,but the percentage was decreased in 2015.3.There were statistical differences in regional composition of influenza-like cases in different years(x~2=38536.525,P<0.001).The proportion of influenza-like cases in Changchun declined,but the proportion of influenza-like cases in Siping and Yanbian increased from 2010 to 2015.4.The number of influenza-like cases in 0-4 group was the highest(36.03%),but more than 60 years old group was the least.There were statistical differences in age composition of influenza-like cases in different years(x~2=8756.432,P<0.001).5.A flu outbreak occurred in a school in Jilin Province from 2010 to 2015 was reported.6.39331 nasopharyngeal swabs specimens with influenza-like illness were collected from 2010 to 2015,and there were 4635 positive strains.The positive rate was 16.10%.The positive rate is higher in 2015(14.87%).The positive rate is lower in 2011(9.33%).7.There was no significant difference in the positive rate of influenza virus between different gender cases(P>0.05).The positive rates of influenza virus were statistically different in different ages and different regions(P<0.001).The positive rate of 0-4 group was lower(10.46%).The positive rates of 5-14 group and more than 60 years old group were higher,respectively 14.09% and 13.62%.The positive rates in Changchun and Baishan were higher,respectively 14.80% and 15.71%.The positive rate in Liaoyuan was lower(3.21%).8.4635 influenza viruses consist of 26 unclassified A types,1 seasonal H1N1 type,887 new H1N1 types,2336 H3N2 types,2 H7N9 types and 1383 B types,the percentage respectively 0.56%,0.02%,19.14%,50.40%,0.04% and 29.84%.There were statistical differences in influenza virus subtypes in different years(P<0.001).9.There was no significant difference in the subtypes of influenza virus between different gender cases(P > 0.05).The subtypes of influenza virus were statistically different in different ages and different regions(P < 0.001).The predominant strains of influenza in 25-59 year old group were mainly H3N2 and new H1N1 types,while the other 4 groups were mainly H3N2 and B.The predominant strains of influenza in Baishan were H3N2 and H1N1,while the other regions' predominant strains of influenza were H3N2 and B in other regions.Conclusions:1.The percentage of influenza-like cases accounted for emergency treatment rose in Jilin Province in 2010-2014,but the percentage was decreased in 2015.2.Winter and spring are high-occurrence seasons for the flu in Jilin Province.The regional composition of influenza-like cases illness cases varies in different years.Children under 5 years old are susceptible populations.3.39331 specimens of nasopharyngeal swabs were detected in 2010-2015 cases of influenza like cases in Jilin Province,of which 4635 were positive,with a positive rate of 11.78%.4.The positive rates of influenza viruses in different years,age groups and different regions are different.In 2015,the positive rate of influenza virus isolation was higher,and the positive rate of influenza virus isolation was lower in 2011.We should strengthen health education and increase the rate of influenza vaccination.5.The positive rates of influenza virus were different in different years,different age groups and different regions.6.The influenza virus subtypes were significantly different in each year.The epidemic dominant virus were new H1N1 subtype and B subtype in 2010;the B subtype in 2011;the new H1N1 subtype and seasonal H3N2 in 2012 and 2013;the seasonal H3N2 subtype and B subtype in 2014 and 2015. |
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