Epidemiological Characteristics Analysis For Influenza-associated Hospitalization In Jingzhou

BACKGROUD AND PURPOSES Analyze the influenza-associated hospitalized burden and epidemiological characteristics in Jingzhou from 2006-2008, through the retrospective survey. The pivotal objectives of our study were to provide the scientific evidence for policy makers to work out the measure for preventing and control influenza, and also prepare for developing the population-based sever acute respiratory infection surveillance system in Jingzhou.METHODS Distribute standard questionnaire to all 36 medical facilities in Jingzhou in order to investigate the medical resources. Synthesize definitions of influenza-associated disease according to the literatures reviewed and local doctors'usual practice for nominating disease, and work out the standard definition for the survey to collect related information from the medical facilities. We do the descriptive analysis to estimate the influenza-associated hospitalized burden, and compare the difference of hospitalization rate among different years, age groups and genders by Chi-square testing, and analyze the impact factor of resident hospital selection by logistic regression analysis with SPSS 17.0.RESULTS Through the medical resource survey, we found that there are total 6022 beds in all the medical facilities of Jingzhou city, and annual hospitalization was 163,300 person time. General hospitals had the highest proportion of the annual hospitalization, whereas the community health care centers had the lowest proportion, and the proportion for number of beds was similar to the proportion of annual hospitalization. Based on the retrospective survey, between January 1, 2006 and December 31, 2008, there were 38,020 episodes of influenza-associated hospitalized cases in 27 medical facilities, the estimated annual hospitalization rate was 11‰, and manifested the escalating trend. The maximum hospitalization rate was 335‰for children under one year old. The highest case fatality of 1.8% was for persons older than 65 year old. Slightly more than half of the influenza-associated cases were in men. Influenza-associated hospitalizations occurred year around, among which, hospitalized cases were most in March, reaching the spring peak. One of the main causes for the local residents admitted to hospitals for influenza-associated disease was acute upper respiratory infection. Multiple-factor and non-conditional logistic regression analysis result showed that the factors influenced influenza-associated residents seeking care were age, gender and year admitted to hospitals.CONCLUSION This study indicated that the health policy maker should distribute rationally the medical resources, especially for the primary health care survey system. The influenza-associated hospitalized burden in the study area was relative high, especially in the infants and elderly people, who would be high risk group. These findings highlight the need for putting more efforts on influenza prevention for both infants and elderly people.