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Volume 32, Number 1—January 2026

Research Letter

Localized Outbreak of Macrolide-Resistant Pertussis in Infants, Japan, March–May 2025

Takafumi ObaraComments to Author , Kyoko Kano, Takashi Yorifuji, Kohei Tsukahara, Naoki Yogo, Yuichiro Muto, Tetsuya Yumoto, Hiromichi Naito, Atsunori Nakao, and Katsuki Hirai
Author affiliation: Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan (T. Obara, K. Kano, N. Yogo, Y. Muto, K. Hirai); Okayama University, Okayama, Japan (T. Obara, T. Yorifuji, K. Tsukahara, T. Yumoto, H. Naito, A. Nakao)

Main Article

Figure

Cumulative reported pertussis cases (all ages) in Kumamoto Prefecture and infant PICU admissions at Kumamoto Red Cross Hospital, from study of a localized outbreak of macrolide-resistant pertussis in infants, Japan, March–May 2025. Reported pertussis cases are based on mandatory notifications (all ages) in Kumamoto Prefecture. PICU data represent infants admitted to the single regional PICU. Numbers above bars indicate total cases (PICU admissions). Data for 2025 are through May, and therefore interpretation of the proportion of PICU admissions relative to total cases should be made with caution. PICU, pediatric intensive care unit.

Figure. Cumulative reported pertussis cases (all ages) in Kumamoto Prefecture and infant PICU admissions at Kumamoto Red Cross Hospital, from study of a localized outbreak of macrolide-resistant pertussis in infants, Japan, March–May 2025. Reported pertussis cases are based on mandatory notifications (all ages) in Kumamoto Prefecture. PICU data represent infants admitted to the single regional PICU. Numbers above bars indicate total cases (PICU admissions). Data for 2025 are through May, and therefore interpretation of the proportion of PICU admissions relative to total cases should be made with caution. PICU, pediatric intensive care unit.

Main Article

Page created: January 16, 2026
Page updated: January 29, 2026
Page reviewed: January 29, 2026
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