Objective:To study the epidemiological characteristics of influenza in Nanjing Children's Hospital during 2013-2017, and provide references for the prevention and control of children's influenza.Methods:Data of influenza-like illness (ILI) cases and etiological detection were collected and analyzed in Nanjing Children's Hospital from 2013 to 2017. Results:A total of 184 488 ILI cases were reported from 2013 to 2017 and the percentage of influenza-like illness cases (ILI%) was 3.65%; a total of 5 643 specimens were collected and virus isolation positive rate was 18.50%. The ILI% was significantly different among different years (χ2 =5 682.98, P<0.001), and virus isolation positive rate was also significantly different among different years (χ2 =52.008, P<0.001). There was one peak in epidemic curves of influenza in year 2013, type A (H3N2) was the epidemic strain. There were two peaks in epidemic curves of influenza in year 2014, 2015, 2016, the epidemic strain was type A (H1N1) and type A (H3N2) in year 2014, type B (BY) and type A (H3N2) in year 2015, type A (H1N1), type B (BV) and type A (H3N2) in year 2016. There was one peak in epidemic curves of influenza in year 2017, type B (BV) was the epidemic strain. The positive rate of influenza virus was significantly different among the different age groups (χ2 =149.74, P<0.001), and had no statistically significant difference between male and female (χ2 =0.134, P>0.05). Conclusion:Children's flu viruses in nanjing mainly type A (H3), type A (H1N1), and type B appeared alternately. Strengthen the vaccination of childcare children and students is conducive to the influenza prevention and control. |
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