A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan

ABSTRACT After the first case of coronavirus disease 2019 (COVID-19) in Japan on 15 January 2020, multiple nationwide COVID-19 clusters were identified by the end of February. The Japanese government focused on mitigating the emerging COVID-19 clusters by conducting active nationwide epidemiological...

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Auteurs principaux: Tsuyoshi Sekizuka, Kentaro Itokawa, Masanori Hashino, Tetsuro Kawano-Sugaya, Rina Tanaka, Koji Yatsu, Asami Ohnishi, Keiko Goto, Hiroyuki Tsukagoshi, Hayato Ehara, Kenji Sadamasu, Masakatsu Taira, Shinichiro Shibata, Ryohei Nomoto, Satoshi Hiroi, Miho Toho, Tomoe Shimada, Tamano Matsui, Tomimasa Sunagawa, Hajime Kamiya, Yuichiro Yahata, Takuya Yamagishi, Motoi Suzuki, Takaji Wakita, Makoto Kuroda
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Publié: American Society for Microbiology 2020
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spelling oai:doaj.org-article:7d14a3ea31d7436ca54d4f80f913084d2021-11-15T15:31:13ZA Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan10.1128/mSphere.00786-202379-5042https://doaj.org/article/7d14a3ea31d7436ca54d4f80f913084d2020-12-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSphere.00786-20https://doaj.org/toc/2379-5042ABSTRACT After the first case of coronavirus disease 2019 (COVID-19) in Japan on 15 January 2020, multiple nationwide COVID-19 clusters were identified by the end of February. The Japanese government focused on mitigating the emerging COVID-19 clusters by conducting active nationwide epidemiological surveillance. However, an increasing number of cases continued to appear until early April 2020, many with unclear infection routes and no recent history of travel outside Japan. We aimed to evaluate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome sequences from the COVID-19 cases that appeared until early April 2020 and to characterize their genealogical networks in order to demonstrate possible routes of spread in Japan. Nasopharyngeal specimens were collected from patients, and reverse transcription-quantitative PCR tests for SARS-CoV-2 were performed. Positive RNA samples were subjected to whole-genome sequencing, and a haplotype network analysis was performed. Some of the primary clusters identified during January and February 2020 in Japan descended directly from the Wuhan-Hu-1-related isolates from China and other distinct clusters. Clusters were almost contained until mid-March; the haplotype network analysis demonstrated that the COVID-19 cases from late March through early April may have created an additional large cluster related to the outbreak in Europe, leading to additional spread within Japan. In conclusion, genome surveillance has suggested that there were at least two distinct SARS-CoV-2 introductions into Japan from China and other countries. IMPORTANCE This study aimed to evaluate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome sequences from COVID-19 cases and to characterize their genealogical networks to demonstrate possible routes of spread in Japan. We found that there were at least two distinct SARS-CoV-2 introductions into Japan, initially from China and subsequently from other countries, including Europe. Our findings can help understand how SARS-CoV-2 entered Japan and contribute to increased knowledge of SARS-CoV-2 in Asia and its association with implemented stay-at-home/shelter-in-place/self-restraint/lockdown measures. This study suggested that it is necessary to formulate a more efficient containment strategy using real-time genome surveillance to support epidemiological field investigations in order to highlight potential infection linkages and mitigate the next wave of COVID-19 in Japan.Tsuyoshi SekizukaKentaro ItokawaMasanori HashinoTetsuro Kawano-SugayaRina TanakaKoji YatsuAsami OhnishiKeiko GotoHiroyuki TsukagoshiHayato EharaKenji SadamasuMasakatsu TairaShinichiro ShibataRyohei NomotoSatoshi HiroiMiho TohoTomoe ShimadaTamano MatsuiTomimasa SunagawaHajime KamiyaYuichiro YahataTakuya YamagishiMotoi SuzukiTakaji WakitaMakoto KurodaAmerican Society for MicrobiologyarticleSARS-CoV-2COVID-19genomehaplotypesepidemiologyimmigrationMicrobiologyQR1-502ENmSphere, Vol 5, Iss 6 (2020)
institution DOAJ
collection DOAJ
language EN
topic SARS-CoV-2
COVID-19
genome
haplotypes
epidemiology
immigration
Microbiology
QR1-502
spellingShingle SARS-CoV-2
COVID-19
genome
haplotypes
epidemiology
immigration
Microbiology
QR1-502
Tsuyoshi Sekizuka
Kentaro Itokawa
Masanori Hashino
Tetsuro Kawano-Sugaya
Rina Tanaka
Koji Yatsu
Asami Ohnishi
Keiko Goto
Hiroyuki Tsukagoshi
Hayato Ehara
Kenji Sadamasu
Masakatsu Taira
Shinichiro Shibata
Ryohei Nomoto
Satoshi Hiroi
Miho Toho
Tomoe Shimada
Tamano Matsui
Tomimasa Sunagawa
Hajime Kamiya
Yuichiro Yahata
Takuya Yamagishi
Motoi Suzuki
Takaji Wakita
Makoto Kuroda
A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan
description ABSTRACT After the first case of coronavirus disease 2019 (COVID-19) in Japan on 15 January 2020, multiple nationwide COVID-19 clusters were identified by the end of February. The Japanese government focused on mitigating the emerging COVID-19 clusters by conducting active nationwide epidemiological surveillance. However, an increasing number of cases continued to appear until early April 2020, many with unclear infection routes and no recent history of travel outside Japan. We aimed to evaluate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome sequences from the COVID-19 cases that appeared until early April 2020 and to characterize their genealogical networks in order to demonstrate possible routes of spread in Japan. Nasopharyngeal specimens were collected from patients, and reverse transcription-quantitative PCR tests for SARS-CoV-2 were performed. Positive RNA samples were subjected to whole-genome sequencing, and a haplotype network analysis was performed. Some of the primary clusters identified during January and February 2020 in Japan descended directly from the Wuhan-Hu-1-related isolates from China and other distinct clusters. Clusters were almost contained until mid-March; the haplotype network analysis demonstrated that the COVID-19 cases from late March through early April may have created an additional large cluster related to the outbreak in Europe, leading to additional spread within Japan. In conclusion, genome surveillance has suggested that there were at least two distinct SARS-CoV-2 introductions into Japan from China and other countries. IMPORTANCE This study aimed to evaluate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome sequences from COVID-19 cases and to characterize their genealogical networks to demonstrate possible routes of spread in Japan. We found that there were at least two distinct SARS-CoV-2 introductions into Japan, initially from China and subsequently from other countries, including Europe. Our findings can help understand how SARS-CoV-2 entered Japan and contribute to increased knowledge of SARS-CoV-2 in Asia and its association with implemented stay-at-home/shelter-in-place/self-restraint/lockdown measures. This study suggested that it is necessary to formulate a more efficient containment strategy using real-time genome surveillance to support epidemiological field investigations in order to highlight potential infection linkages and mitigate the next wave of COVID-19 in Japan.
format article
author Tsuyoshi Sekizuka
Kentaro Itokawa
Masanori Hashino
Tetsuro Kawano-Sugaya
Rina Tanaka
Koji Yatsu
Asami Ohnishi
Keiko Goto
Hiroyuki Tsukagoshi
Hayato Ehara
Kenji Sadamasu
Masakatsu Taira
Shinichiro Shibata
Ryohei Nomoto
Satoshi Hiroi
Miho Toho
Tomoe Shimada
Tamano Matsui
Tomimasa Sunagawa
Hajime Kamiya
Yuichiro Yahata
Takuya Yamagishi
Motoi Suzuki
Takaji Wakita
Makoto Kuroda
author_facet Tsuyoshi Sekizuka
Kentaro Itokawa
Masanori Hashino
Tetsuro Kawano-Sugaya
Rina Tanaka
Koji Yatsu
Asami Ohnishi
Keiko Goto
Hiroyuki Tsukagoshi
Hayato Ehara
Kenji Sadamasu
Masakatsu Taira
Shinichiro Shibata
Ryohei Nomoto
Satoshi Hiroi
Miho Toho
Tomoe Shimada
Tamano Matsui
Tomimasa Sunagawa
Hajime Kamiya
Yuichiro Yahata
Takuya Yamagishi
Motoi Suzuki
Takaji Wakita
Makoto Kuroda
author_sort Tsuyoshi Sekizuka
title A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan
title_short A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan
title_full A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan
title_fullStr A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan
title_full_unstemmed A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan
title_sort genome epidemiological study of sars-cov-2 introduction into japan
publisher American Society for Microbiology
publishDate 2020
url https://doaj.org/article/7d14a3ea31d7436ca54d4f80f913084d
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