Characteristics of Geographical Spread and Temporal Accumulation of the 2009 Influenza A (H1N1) Epidemic in Japan Based on National Surveillance Data
スポンサーリンク
概要
- 論文の詳細を見る
This study aimed to describe the geographical spread and temporal accumulation of cases during the 2009 influenza A (H1N1) epidemic in Japan. Using a method adopted by the National Epidemiological Surveillance of Infectious Diseases (NESID) to identify epidemics, we described the frequency and temporal change of the 2009 influenza A (H1N1) epidemic among designated public health center areas in Japan. We calculated the proportion of public health center areas with an epidemic by week from 1999 to 2010. The 2009 influenza A (H1N1) epidemic had several distinguishing features compared with previous seasonal influenza epidemics. For example, the 2009 epidemic started in autumn and peaked at week 49, almost 10 weeks earlier than that of previous seasonal influenza epidemics. Additionally, the 2009 epidemic had the highest total number of public health center areas reporting an epidemic within a season, but only the second highest proportion of areas with an epidemic in the peak week (78.5%). The duration of the epidemic was 17 weeks, which was longer than that of previous epidemics. The present study results shed light on the epidemiology of the 2009 influenza A (H1N1) pandemic and provide useful information to create strategies to prevent future pandemics.
著者
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Tada Yuki
Infectious Disease Surveillance Center National Inst. Of Infectious Diseases.
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Nagai Masaki
Department Of Aeronautics And Astronautics University Of Tokyo
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Taniguchi Kiyosu
Department Of Pediatrics Mie University School Of Medicine
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Hashimoto Shuji
Department Of Applied Biological Chemistry Faculty Of Agriculture Niigata University
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Murakami Yoshitaka
Department Of Health Science Shgia University Of Medical Science
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Shigematsu Mika
Infectious Disease Surveillance Center National Institute Of Infectious Diseases
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Kawado Miyuki
Department Of Epidemiology And Environmental Health Juntendo University School Of Medicine
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MURAKAMI Yoshitaka
Department of Medical Statistics, Shiga University of Medical Science
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OHTA Akiko
Department of Biochemistry, Central Research Laboratories, Yamanouchi Pharmaceutical Co., Ltd.
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