Author affiliations: National Institute of Infectious Diseases, Tokyo, Japan (H. Kamiya, N. Otsuka, Y. Ando, F. Odaira, H. Toyoizumi-Ajisaka, K. Shibayama, K. Kamachi, T. Sunagawa, K. Taniguchi, N. Okabe); Miyazaki Prefectural Institute for Public Health and Environment, Miyazaki, Japan (S. Yoshino, K. Kawano); Takahashi Clinic, Miyazaki (H. Takahashi); and Nobeoka Public Health Center, Miyazaki (T. Nishida, Y. Hidaka)
Figure 1. . . Epidemic curve of a pertussis outbreak, September 2010–April 2011, Japan. A) Suspected cases of pertussis. B) Laboratory-confirmed cases of Bordetella pertussis and B. holmesii infection. *As of September 20–26, 2010.
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