Epidemiology of Coronavirus Disease 2019 in Yamagata Prefecture, Japan, January–May 2020: the Importance of Retrospective Contact Tracing
Public health interventions have played an important role in controlling coronavirus disease 2019 (COVID-19), which is a rapidly spreading infectious disease. To contribute to future COVID-19 countermeasures, we aimed to verify the results of the countermeasures employed by public health centers (PH...
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| Veröffentlicht in: | Japanese Journal of Infectious Diseases 2021/11/22, Vol.74(6), pp.522-529 |
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| creator | Seto, Junji Aoki, Yoko Komabayashi, Kenichi Ikeda, Yoko Sampei, Mika Ogawa, Naomi Uchiumi, Yumiko Fujii, Shunji Chiba, Masami Suzuki, Emiko Takahashi, Tatsuya Yamada, Keiko Otani, Yoshiko Ashino, Yoshihiro Araki, Kyoko Kato, Takeo Ishikawa, Hitoshi Ikeda, Tatsuya Abe, Hideaki Ahiko, Tadayuki Mizuta, Katsumi |
| description | Public health interventions have played an important role in controlling coronavirus disease 2019 (COVID-19), which is a rapidly spreading infectious disease. To contribute to future COVID-19 countermeasures, we aimed to verify the results of the countermeasures employed by public health centers (PHCs) against the first wave of COVID-19 in Yamagata Prefecture, Japan (Yamagata). Between January and May 2020, 1,253 patients suspected of SARS-CoV-2 infection were invited for testing. Simultaneously, based on retrospective contact tracings, PHCs investigated the infection sources and transmission routes of laboratory-confirmed COVID-19 cases and tested 928 contacts. Consequently, 69 cases were confirmed between March 31 and May 4, 58 of whom were from among the contacts (84.1%; 95% confidence interval [CI] 75.5–92.7). The spread of infection was triggered in cases harboring epidemiological links outside Yamagata. Subsequently, the number of cases rapidly increased. However, PHCs identified epidemiological links in 61 (88.4%; 95% CI 80.8–96.0) of the 69 cases, and transmission chains up to the fifth generation. Finally, the spread of infection ended after approximately one month. Our results indicate that the identification of infection sources and active case finding from contacts based on retrospective contact tracing was likely to be an effective strategy in ending the first wave of COVID-19 in Yamagata. |
| doi_str_mv | 10.7883/yoken.JJID.2020.1073 |
| format | Article |
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To contribute to future COVID-19 countermeasures, we aimed to verify the results of the countermeasures employed by public health centers (PHCs) against the first wave of COVID-19 in Yamagata Prefecture, Japan (Yamagata). Between January and May 2020, 1,253 patients suspected of SARS-CoV-2 infection were invited for testing. Simultaneously, based on retrospective contact tracings, PHCs investigated the infection sources and transmission routes of laboratory-confirmed COVID-19 cases and tested 928 contacts. Consequently, 69 cases were confirmed between March 31 and May 4, 58 of whom were from among the contacts (84.1%; 95% confidence interval [CI] 75.5–92.7). The spread of infection was triggered in cases harboring epidemiological links outside Yamagata. Subsequently, the number of cases rapidly increased. However, PHCs identified epidemiological links in 61 (88.4%; 95% CI 80.8–96.0) of the 69 cases, and transmission chains up to the fifth generation. Finally, the spread of infection ended after approximately one month. Our results indicate that the identification of infection sources and active case finding from contacts based on retrospective contact tracing was likely to be an effective strategy in ending the first wave of COVID-19 in Yamagata.</description><identifier>ISSN: 1344-6304</identifier><identifier>EISSN: 1884-2836</identifier><identifier>DOI: 10.7883/yoken.JJID.2020.1073</identifier><identifier>PMID: 33790065</identifier><language>eng</language><publisher>Japan: National Institute of Infectious Diseases, Japanese Journal of Infectious Diseases Editorial Committee</publisher><subject>close contact ; cluster-based approach ; Confidence intervals ; Contact ; Contact Tracing ; Coronaviruses ; COVID-19 ; COVID-19 - epidemiology ; Disease control ; Disease transmission ; Epidemiology ; Humans ; infection source ; Infections ; Infectious diseases ; Japan - epidemiology ; Public health ; Retrospective Studies ; SARS-CoV-2 ; Severe acute respiratory syndrome coronavirus 2 ; testing ; Viral diseases</subject><ispartof>Japanese Journal of Infectious Diseases, 2021/11/22, Vol.74(6), pp.522-529</ispartof><rights>2021 Authors</rights><rights>Copyright Japan Science and Technology Agency 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c622t-866789ad7062f9edc63836b1404254bc673d5b0ecea32f327a54c360f101a7ba3</citedby><cites>FETCH-LOGICAL-c622t-866789ad7062f9edc63836b1404254bc673d5b0ecea32f327a54c360f101a7ba3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,778,782,1879,27907,27908</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/33790065$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Seto, Junji</creatorcontrib><creatorcontrib>Aoki, Yoko</creatorcontrib><creatorcontrib>Komabayashi, Kenichi</creatorcontrib><creatorcontrib>Ikeda, Yoko</creatorcontrib><creatorcontrib>Sampei, Mika</creatorcontrib><creatorcontrib>Ogawa, Naomi</creatorcontrib><creatorcontrib>Uchiumi, Yumiko</creatorcontrib><creatorcontrib>Fujii, Shunji</creatorcontrib><creatorcontrib>Chiba, Masami</creatorcontrib><creatorcontrib>Suzuki, Emiko</creatorcontrib><creatorcontrib>Takahashi, Tatsuya</creatorcontrib><creatorcontrib>Yamada, Keiko</creatorcontrib><creatorcontrib>Otani, Yoshiko</creatorcontrib><creatorcontrib>Ashino, Yoshihiro</creatorcontrib><creatorcontrib>Araki, Kyoko</creatorcontrib><creatorcontrib>Kato, Takeo</creatorcontrib><creatorcontrib>Ishikawa, Hitoshi</creatorcontrib><creatorcontrib>Ikeda, Tatsuya</creatorcontrib><creatorcontrib>Abe, Hideaki</creatorcontrib><creatorcontrib>Ahiko, Tadayuki</creatorcontrib><creatorcontrib>Mizuta, Katsumi</creatorcontrib><title>Epidemiology of Coronavirus Disease 2019 in Yamagata Prefecture, Japan, January–May 2020: the Importance of Retrospective Contact Tracing</title><title>Japanese Journal of Infectious Diseases</title><addtitle>Jpn J Infect Dis</addtitle><description>Public health interventions have played an important role in controlling coronavirus disease 2019 (COVID-19), which is a rapidly spreading infectious disease. To contribute to future COVID-19 countermeasures, we aimed to verify the results of the countermeasures employed by public health centers (PHCs) against the first wave of COVID-19 in Yamagata Prefecture, Japan (Yamagata). Between January and May 2020, 1,253 patients suspected of SARS-CoV-2 infection were invited for testing. Simultaneously, based on retrospective contact tracings, PHCs investigated the infection sources and transmission routes of laboratory-confirmed COVID-19 cases and tested 928 contacts. Consequently, 69 cases were confirmed between March 31 and May 4, 58 of whom were from among the contacts (84.1%; 95% confidence interval [CI] 75.5–92.7). The spread of infection was triggered in cases harboring epidemiological links outside Yamagata. Subsequently, the number of cases rapidly increased. However, PHCs identified epidemiological links in 61 (88.4%; 95% CI 80.8–96.0) of the 69 cases, and transmission chains up to the fifth generation. Finally, the spread of infection ended after approximately one month. Our results indicate that the identification of infection sources and active case finding from contacts based on retrospective contact tracing was likely to be an effective strategy in ending the first wave of COVID-19 in Yamagata.</description><subject>close contact</subject><subject>cluster-based approach</subject><subject>Confidence intervals</subject><subject>Contact</subject><subject>Contact Tracing</subject><subject>Coronaviruses</subject><subject>COVID-19</subject><subject>COVID-19 - epidemiology</subject><subject>Disease control</subject><subject>Disease transmission</subject><subject>Epidemiology</subject><subject>Humans</subject><subject>infection source</subject><subject>Infections</subject><subject>Infectious diseases</subject><subject>Japan - epidemiology</subject><subject>Public health</subject><subject>Retrospective Studies</subject><subject>SARS-CoV-2</subject><subject>Severe acute respiratory syndrome coronavirus 2</subject><subject>testing</subject><subject>Viral diseases</subject><issn>1344-6304</issn><issn>1884-2836</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkcFu1DAQhiMEoqXwBghZ4sKBLI6d2Am3atvCropAqBw4WRNnss2S2MF2Ku2td468IU-Cwy4rwcXjwzf_zPx_kjzP6EKWJX-zs9_QLNbr1cWCUUYXGZX8QXKalWWespKLh_HP8zwVnOYnyRPvt5Syosjo4-SEc1lRKorT5Mfl2DU4dLa3mx2xLVlaZw3cdW7y5KLzCB4Jo1lFOkO-wgAbCEA-OWxRh8nha7KGEcxczARu9-v-5wfYkXmjtyTcIlkNo3UBjMZZ_TMGZ_0Ye7s7jLNMAB3IjQPdmc3T5FELvcdnh3qWfLm6vFm-T68_vlstz69TLRgLaSmELCtoJBWsrbDRgsdz6yynOSvyWgvJm6KmqBE4azmTUOSaC9pmNANZAz9LXu11R2e_T-iDGjqvse_BoJ28YgWVksmKVxF9-R-6tZMzcTvFBC1YKTNZRCrfUzoe56M3anTdEN1QGVVzWOpPWGoOS83WqDms2PbiID7VAzbHpr_pRGC9B7Y-wAaPALjQ6R4PqjJXYn7-VT9C-hacQsN_A2gyq_g</recordid><startdate>20211122</startdate><enddate>20211122</enddate><creator>Seto, Junji</creator><creator>Aoki, Yoko</creator><creator>Komabayashi, Kenichi</creator><creator>Ikeda, Yoko</creator><creator>Sampei, Mika</creator><creator>Ogawa, Naomi</creator><creator>Uchiumi, Yumiko</creator><creator>Fujii, Shunji</creator><creator>Chiba, Masami</creator><creator>Suzuki, Emiko</creator><creator>Takahashi, Tatsuya</creator><creator>Yamada, Keiko</creator><creator>Otani, Yoshiko</creator><creator>Ashino, Yoshihiro</creator><creator>Araki, Kyoko</creator><creator>Kato, Takeo</creator><creator>Ishikawa, Hitoshi</creator><creator>Ikeda, Tatsuya</creator><creator>Abe, Hideaki</creator><creator>Ahiko, Tadayuki</creator><creator>Mizuta, Katsumi</creator><general>National Institute of Infectious Diseases, Japanese Journal of Infectious Diseases Editorial Committee</general><general>Japan Science and Technology Agency</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QL</scope><scope>7T5</scope><scope>7T7</scope><scope>7TK</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>20211122</creationdate><title>Epidemiology of Coronavirus Disease 2019 in Yamagata Prefecture, Japan, January–May 2020: the Importance of Retrospective Contact Tracing</title><author>Seto, Junji ; 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To contribute to future COVID-19 countermeasures, we aimed to verify the results of the countermeasures employed by public health centers (PHCs) against the first wave of COVID-19 in Yamagata Prefecture, Japan (Yamagata). Between January and May 2020, 1,253 patients suspected of SARS-CoV-2 infection were invited for testing. Simultaneously, based on retrospective contact tracings, PHCs investigated the infection sources and transmission routes of laboratory-confirmed COVID-19 cases and tested 928 contacts. Consequently, 69 cases were confirmed between March 31 and May 4, 58 of whom were from among the contacts (84.1%; 95% confidence interval [CI] 75.5–92.7). The spread of infection was triggered in cases harboring epidemiological links outside Yamagata. Subsequently, the number of cases rapidly increased. However, PHCs identified epidemiological links in 61 (88.4%; 95% CI 80.8–96.0) of the 69 cases, and transmission chains up to the fifth generation. Finally, the spread of infection ended after approximately one month. Our results indicate that the identification of infection sources and active case finding from contacts based on retrospective contact tracing was likely to be an effective strategy in ending the first wave of COVID-19 in Yamagata.</abstract><cop>Japan</cop><pub>National Institute of Infectious Diseases, Japanese Journal of Infectious Diseases Editorial Committee</pub><pmid>33790065</pmid><doi>10.7883/yoken.JJID.2020.1073</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | close contact cluster-based approach Confidence intervals Contact Contact Tracing Coronaviruses COVID-19 COVID-19 - epidemiology Disease control Disease transmission Epidemiology Humans infection source Infections Infectious diseases Japan - epidemiology Public health Retrospective Studies SARS-CoV-2 Severe acute respiratory syndrome coronavirus 2 testing Viral diseases |
| title | Epidemiology of Coronavirus Disease 2019 in Yamagata Prefecture, Japan, January–May 2020: the Importance of Retrospective Contact Tracing |
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