A single-center descriptive study of untraced sources of infection among new cases of coronavirus disease in Tokyo, Japan

Sayaka Hikida; Shinichiro Morioka; Naoki Fujii; Taichi Tajima; Yuriko Terayama; Yuriko Sugiura; Masahiro Ishikane; Jin Takasaki; Masayuki Hojo; Norio Ohmagari

doi:10.35772/ghm.2021.01092

This article has now been updated. Please use the final version.

A single-center descriptive study of untraced sources of infection among new cases of coronavirus disease in Tokyo, Japan

Sayaka Hikida, Shinichiro Morioka, Naoki Fujii, Taichi Tajima, Yuriko Terayama, Yuriko Sugiura, Masahiro Ishikane, Jin Takasaki, Masayuki Hojo, Norio Ohmagari

Author information

Sayaka Hikida
Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Shinichiro Morioka
Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Emerging and Re-emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Japan.
AMR Clinical Reference Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Naoki Fujii
AMR Clinical Reference Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Taichi Tajima
AMR Clinical Reference Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Yuriko Terayama
Division of Respiratory Medicine, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Yuriko Sugiura
Division of Respiratory Medicine, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Masahiro Ishikane
Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
AMR Clinical Reference Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Jin Takasaki
Division of Respiratory Medicine, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Masayuki Hojo
Division of Respiratory Medicine, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
Norio Ohmagari
Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.
AMR Clinical Reference Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan.

Keywords: coronavirus disease, untraced sources of infection, high-risk infection behavior, indoor dining, mask

JOURNAL FREE ACCESS Advance online publication

Article ID: 2021.01092

DOI https://doi.org/10.35772/ghm.2021.01092

The final version of this article is now available: Vol. 3 (2021), No. 4 pp. 236-239

Details

Abstract

We investigated possible sources of newly infected patients with coronavirus disease (COVID-19) after the fourth wave in order to explore unknown sources. Retrospective chart review on all the confirmed patients with COVID-19 admitted to the National Center for Global Health and Medicine (NCGM) in Tokyo, Japan was conducted from May 22 through June 29, 2021. Among the 22 participants, 14 (64%) had a history of known high-risk infection behaviors. Of those, 12 reported that their activities involved eating and drinking. In addition, there were 24 high-risk situations, of those, 21 (88%) were related to indoor dining, and masks were not worn in 22 situations (92%). New source of infection has not been identified. In situations with a high known risk of infection, many cases were related to eating and drinking, and insufficient use of masks was evident. Raising risk awareness on infection prevention and control of COVID-19 is urgently needed.

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