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 2. . . Epidemiologic linkage in 6 patients infected with Bordetella holmesii during pertussis outbreak, Japan, 2011. Duration of illness for each patient is shown as a gray box. Patient 3 provided unreliable information about the date of onset and recovery, but the patient’s cough lasted for >1 month. Epidemiologic linkage was observed between 5 patients (patients 2–6), but not for patient 1.
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