Association between seasonal influenza vaccination in 2008-2009 and pandemic influenza A (H1N1) 2009 infection among school students from Kobe, Japan, April-June 2009 |
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| Authors: | Tsuchihashi Yuuki Sunagawa Tomimasa Yahata Yuichiro Takahashi Hideaki Toyokawa Takao Odaira Fumito Ohyama Takaaki Taniguchi Kiyosu Okabe Nobuhiko |
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| Affiliation: | Field Epidemiology Training Program, National Institute of Infectious Diseases, Tokyo, Japan. yuuki.tsuchihashi@gmail.com |
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| Abstract: | We assessed the effect of seasonal trivalent inactivated influenza vaccination (TIV) on pandemic influenza 2009 (pH1N1)-related illness from April to June 2009 among 2849 students (aged 12-18 years). TIV was associated with an increase in the frequency of pH1N1-related illness among subjects (adjusted odds ratio, 1.47; 95% confidence interval, 1.14-1.89). TIV during the 2008-2009 season increased the risk of pH1N1-related illness from April to June 2009. |
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