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| An analysis on the influenza-related excess mortalityin Ningbo City |
| LAO Xu-ying, JIAO Su-li, JI Wei, YI Bo
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| The Center for Disease Control and Prevention of Ningbo City,Ningbo, Zhejiang,315010 , China |
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Abstract Objective To examine influenza-related excess mortality in Ningbo City from 2010—2014. Methods Data related to death and virology were collected from surveillance system of Ningbo Center for Disease Control and Prevention from 2010 to 2014.Rate differential model was used for data analysis to calculate excess mortality caused by five different cause of death. Results The duration of influenza prevalence was about 37 weeks from 2010 to 2014. The prevalent influenza strains from 2010—2013 were type B, H1NI and H3N2, and the prevalent influenza strains in 2014 were H1NI and H3N2 . From 2010 to 2014,for all cause of death (AC), the average influence-related excess mortality per week was 2.54 per 100 000 in Ningbo City. In five influence seasons, the average influence-related excess mortality for AC were 12.66/100 000, 15.19/100 000, 27.86/100 000, 12.66/100 000 and 25.32/100 000, respectively. The average influence-related excess mortality for five cause of death (PI,RC,IHD,COPD,AC) were 1.68/100 000, 12.83/100 000, 1.34/100 000, 0.84/100 000 and 18.74/100 000. During 5 monitoring years, annual excess mortality of≥65 group were more higher than that of total population, and annual excess mortality of 0-4 group were lower than that of total population. Conclusion Influenza was prevalent mainly in winter and spring. The excess mortality resulted from influenza was high. Vaccinating people older than 65 and chronic cardiovascular patients could reduce the risk.
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Received: 31 March 2016
Published: 20 December 2017
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