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  • Title: Efficacy of trivalent seasonal influenza vaccination in reducing mortality and hospitalization in Chinese nursing home older adults.
    Author: Chan TC, Fan-Ngai Hung I, Ka-Hay Luk J, Chiu-Yat Woo P, Chu LW, Hon-Wai Chan F.
    Journal: J Am Med Dir Assoc; 2013 Dec; 14(12):889-94. PubMed ID: 23702605.
    Abstract:
    OBJECTIVE: To examine the clinical efficacy of the trivalent seasonal influenza vaccination among Chinese older adults residing in a nursing home. DESIGN: A 12-month prospective cohort study. Participants were divided into 2 groups based on their own choice on vaccination of trivalent seasonal influenza vaccine: vaccinated group and unvaccinated group. SETTING: Fifty-eight nursing homes in Hong Kong. PARTICIPANTS: A total of 1859 older adults residing in a nursing home. MEASUREMENTS: All-cause mortality, pneumonia-related mortality, all-cause hospitalization, and pneumonia-related hospitalization. RESULTS: A total of 1859 older adults residing in a nursing home were included: 1214 (65.3%) in the vaccinated group and 645 (34.7%) in the unvaccinated group. At 12 months of study, for all-cause mortality, 14.6% (177 of 1214) of the vaccinated group and 20.2% (130 of 645) of the unvaccinated group had died (P < .001). Multivariate analysis showed the hazard ratio for the vaccinated group was 0.72 (95% confidence interval [CI]: 0.54-0.95; P < .01). For pneumonia-related mortality, 9.4% (114 of 1214) of the vaccinated group and 12.7% (82 of 645) of the unvaccinated group died (P = .033). Multivariate analysis showed the hazard ratio for the vaccinated group was 0.80 (CI: 0.62-0.98; P < .05). The median number of all-cause hospitalizations per 1000 person-months was 55 (0-111) for the vaccinated group and 55 (0-167) for the unvaccinated group (P < .01). The median number of pneumonia-related hospitalizations per 1000 person-months was 0 (0-55) for the vaccinated group and 0 (0-111) for the unvaccinated group (P < .01). CONCLUSIONS: Vaccination of trivalent seasonal influenza vaccine in Chinese nursing home older adults significantly reduced all-cause and pneumonia-related mortality and hospitalization.
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