A中学校高等学校における新型インフルエンザA(H1N1)感染者の特徴,および感染拡大に関する検討

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Objectives: To assess the epidemiological features of pandemic influenza A (H1N1) and the effectiveness of school closures in a secondary school during the first pandemic influenza A (H1N1) outbreak in Osaka, Japan in May 2009. Methods: The National Institute of Infectious Diseases (NIID) in Japan conducted active surveillance of the pandemic influenza A (H1N1) outbreak in a secondary school in Osaka. Telephone interviews were performed with the students by school teachers using a standardized questionnaire. Direct face-to-face interviews were carried out by the NIID with 17 hospitalized patients. Confirmed and suspected cases were defined to describe the outbreak. We analyzed the transmission of pandemic influenza A (H1N1) and characteristics of the patients. Results: Eighty-eight confirmed and 108 suspected cases had been reported by the end of May. The epidemic curve of ILI cases shows the outbreak peaked on May 17 and ceased on May 22. Significant differences were observed when taking into account sex, grade, and class as risk factors. However, commuting by school bus, afterschool activities, and clubs were not significant. Conclusion: Transmission occurred among classmates, resulting from close contact between an infected individual and a susceptible host. School closure was effective in containing transmission within the school.
2011-10-00