Author affiliations: Juntendo University Faculty of Medicine, Tokyo, Japan (A. Okumura, T. Shimizu); National Center for Child Health and Development, Tokyo (S. Nakagawa, T. Muguruma, O. Saito, J. Fujimoto, C. Toida, S. Kuga, T. Imamura); Tokyo Medical University, Tokyo (H. Kawashima); Gifu University Graduate School of Medicine, Gifu, Japan (N. Kondo); Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan (T. Morishima)
Figure 1. Timing of onset of pandemic (H1N1) 2009 in children and patient age, Japan, May 2009–March 2010. A) Date of illness onset for children >15 years of age compared with those <15 years of age. B) No. patients at each age at time of illness onset.
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