Factors associated with infection by 2009 pandemic H1N1 influenza virus during different phases of the epidemic

Day Yu Chao, Kuang Fu Cheng, Tsai Chung Li, Trong Neng Wu, Chiu Ying Chen, Chen An Tsai, Jin Hua Chen, Hsien Tsai Chiu, Jang Jih Lu, Mei Chi Su, Yu Hsin Liao, Wei Cheng Chan, Ying Hen Hsieh

研究成果: 雜誌貢獻文章

6 引文 斯高帕斯(Scopus)

摘要

Objective: The focus of this study was to ascertain the factors associated with 2009 pandemic influenza H1N1 (pH1N1) infection during different phases of the epidemic. Methods: In central Taiwan, 306 persons from households with schoolchildren were followed sequentially and serum samples were taken at three sampling time-points starting in the fall of 2008, shortly after influenza vaccination. Participants who seroconverted between two consecutive blood samplings were considered as having serological evidence of infection. A generalized estimation equation (GEE) with a logistic link to account for household correlations was applied to identify factors associated with pH1N1 infections during the pre-epidemic (April-June) and epidemic (September-October) periods. Results: The results showed that receiving an inactivated seasonal influenza vaccine (ISIV) and having a hemagglutination inhibition assay (HI) titer of 40 or higher resulted in a significantly lower likelihood of pH1N1 infection during the pre-epidemic period only, for both children and adults (adjusted odds ratio (OR) 0.3, 95% confidence interval (CI) 0.12-0.9). Having a previous infection by pH1N1 with a baseline titer of 20 or higher resulted in a significantly lower likelihood of infection by pH1N1 during the epidemic period (adjusted OR 0.06, 95% CI 0.02-0.16). Conclusions: Our results provide the first serological evidence to suggest a protection effect from receiving an ISIV against pH1N1 infection only when the HI titer reaches 40 or higher during the pre-epidemic period. This study gives an important insight into the control and intervention measures required for preventing infections during future influenza epidemics.

原文英語
期刊International Journal of Infectious Diseases
15
發行號10
DOIs
出版狀態已發佈 - 十月 2011
對外發佈Yes

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases

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    Chao, D. Y., Cheng, K. F., Li, T. C., Wu, T. N., Chen, C. Y., Tsai, C. A., Chen, J. H., Chiu, H. T., Lu, J. J., Su, M. C., Liao, Y. H., Chan, W. C., & Hsieh, Y. H. (2011). Factors associated with infection by 2009 pandemic H1N1 influenza virus during different phases of the epidemic. International Journal of Infectious Diseases, 15(10). https://doi.org/10.1016/j.ijid.2011.05.012