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Volume 29, Number 5—May 2023
Research

Case–Control Study of Long COVID, Sapporo, Japan

Toshiaki Asakura1, Takashi Kimura1Comments to Author , Isaku Kurotori, Katabami Kenichi, Miyuki Hori, Mariko Hosogawa, Masayuki Saijo, Kaori Nakanishi, Hiroyasu Iso, and Akiko Tamakoshi
Author affiliations: Hokkaido University, Sapporo, Japan (T. Asakura, T. Kimura, I. Kurotori, K. Kenichi, A. Tamakoshi); National Center for Global Health and Medicine, Tokyo, Japan (M. Hori, M. Hosogawa, H. Iso); Health and Welfare Bureau, Sapporo (M. Saijo, K. Nakanishi)

Main Article

Figure 1

Daily COVID-19 cases, cumulative incidence, and vaccination rates during a case–control study of long COVID, Sapporo, Japan, August 2020–March 2022. A) Number of daily COVID-19 cases and cumulative incidence rates. B) Vaccination rates among the population of Sapporo. Date range represents timeframe in which participating case-patients might have been infected. Vertical black lines indicate February 1, 2022, the date potential participants were randomly identified. Yellow shading at right indicates the period of the survey in this study, February 21–March 31, 2022.

Figure 1. Daily COVID-19 cases, cumulative incidence, and vaccination rates during a case–control study of long COVID, Sapporo, Japan, August 2020–March 2022. A) Number of daily COVID-19 cases and cumulative incidence rates. B) Vaccination rates among the population of Sapporo. Date range represents timeframe in which participating case-patients might have been infected. Vertical black lines indicate February 1, 2022, the date potential participants were randomly identified. Yellow shading at right indicates the period of the survey in this study, February 21–March 31, 2022.

Main Article

1These authors contributed equally to this article.

Page created: March 13, 2023
Page updated: April 18, 2023
Page reviewed: April 18, 2023
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