Assessing the Regional Impact of Japan's COVID-19
Open access Original research BMJ Open: first published as 10.1136/bmjopen-2020-042002 on 15 February 2021. Downloaded from Assessing the regional impact of Japan’s COVID-19 state of emergency declaration: a population- level observational study using social networking services Daisuke Yoneoka ,1,2,3 Shoi Shi,4,5 Shuhei Nomura ,1,3 Yuta Tanoue,6 Takayuki Kawashima,7 Akifumi Eguchi,8 Kentaro Matsuura,9,10 Koji Makiyama,10,11 Shinya Uryu,12 Keisuke Ejima,13 Haruka Sakamoto,1,3 Toshibumi Taniguchi,14 Hiroyuki Kunishima,15 Stuart Gilmour,2 Hiroshi Nishiura ,16 Hiroaki Miyata1 To cite: Yoneoka D, Shi S, ABSTRACT Strengths and limitations of this study Nomura S, et al. Assessing Objective On 7 April 2020, the Japanese government the regional impact of Japan’s declared a state of emergency in response to the novel ► Using data from the social networking service (SNS) COVID-19 state of emergency coronavirus outbreak. To estimate the impact of the declaration: a population- level messaging application, this study, for the first time, declaration on regional cities with low numbers of observational study using social evaluated the impact of Japan’s declaration of a COVID-19 cases, large- scale surveillance to capture the networking services. BMJ Open state of emergency on regional cities with low num- current epidemiological situation of COVID-19 was urgently 2021;11:e042002. doi:10.1136/ bers of COVID-19 cases. bmjopen-2020-042002 conducted in this study. ► This study succeeded in capturing the real- time Design Cohort study. epidemiology of COVID-19 using SNS data in local ► Prepublication history and Setting Social networking service (SNS)- based online additional material for this Japan and identified several geographical hot spots.
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