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Volume 28, Number 11—November 2022
Research

Age-Stratified Seroprevalence of SARS-CoV-2 Antibodies before and during the Vaccination Era, Japan, February 2020–March 2022

Seiya YamayoshiComments to Author , Kiyoko Iwatsuki-Horimoto, Moe Okuda, Michiko Ujie, Atsuhiro Yasuhara, Jurika Murakami, Calvin Duong, Taiki Hamabata, Mutsumi Ito, Shiho Chiba, Ryo Kobayashi, Satoshi Takahashi, Keiko Mitamura, Masao Hagihara, Akimichi Shibata, Yoshifumi Uwamino, Naoki Hasegawa, Toshiaki Ebina, Akihiko Izumi, Hideaki Kato, Hideaki Nakajima, Norio Sugaya, Yuki Seki, Asef Iqbal, Isamu Kamimaki, Masahiko Yamazaki, Yoshihiro KawaokaComments to Author , and Yuki FuruseComments to Author 
Author affiliations: University of Tokyo, Tokyo, Japan (S. Yamayosh, K. Iwatsuki-Horimoto, M. Okuda, M. Ujie, A. Yasuhara, J. Murakami, C. Duong, T. Hamabata, M. Ito, Y. Kawaoka); National Center for Global Health and Medicine, Tokyo (S. Yamayoshi, Y. Kawaoka); University of Wisconsin–Madison, Madison, Wisconsin, USA (S. Chiba, Y. Kawaoka); Sapporo Medical University Hospital, Sapporo, Japan (R. Kobayashi); Sapporo Medical University School of Medicine, Sapporo (S. Takahashi); Eiju General Hospital, Tokyo (K. Mitamura, M. Hagihara); Japanese Red Cross Ashikaga Hospital, Ashikaga, Japan (A. Shibata); Keio University School of Medicine, Tokyo (A. Shibata, Y. Uwamino, N. Hasegawa, N. Sugaya); Yokohama City University Medical Center, Yokohama, Japan (T. Ebina, A. Izumi); Yokohama City University Hospital, Yokohama (H. Kato); Yokohama City University Graduate School of Medicine, Yokohama (H. Kato, H. Nakajima); Keiyu Hospital, Yokohama (Y. Seki); National Hospital Organization Saitama Hospital, Wako, Japan (A. Iqbal, I. Kamimaki); Zama Children’s Clinic, Zama, Japan (M. Yamazaki); Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan (Y. Furuse); Nagasaki University Hospital, Nagasaki, Japan (Y. Furuse)

Main Article

Figure 1

Epidemic curve of COVID-19 in Japan, January 2020–March 2022. The daily numbers of reported COVID-19 cases per100 persons in all of Japan, the Tokyo Metropolitan Area, and Hokkaido Prefecture are shown. The numbers indicate the 6 epidemic waves. The fourth, fifth, and sixth waves were driven by the Alpha, Delta, and Omicron variants of SARS-CoV-2, respectively.

Figure 1. Epidemic curve of COVID-19 in Japan, January 2020–March 2022. The daily numbers of reported COVID-19 cases per100 persons in all of Japan, the Tokyo Metropolitan Area, and Hokkaido Prefecture are shown. The numbers indicate the 6 epidemic waves. The fourth, fifth, and sixth waves were driven by the Alpha, Delta, and Omicron variants of SARS-CoV-2, respectively.

Main Article

Page created: September 12, 2022
Page updated: October 21, 2022
Page reviewed: October 21, 2022
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