Abstract:Introduction The 2009 A/H1N1 influenza spread also in Japan. Many students were absent in elementary schools, To prevent its expansion, many school decided class closure with their original length under rough guideline by local education board. However, its effect had not been clear. The objective was to examine whether or not the class closure length related to the change of absentees. Methods Subject was all the classes in elementary schools in T city that class closure was carried in the period from 1 Septe… Show more
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