2020-03-02 who調査報告書 WHO調査報告書 症状の特徴・致死率など詳しい分析明らかに | NHKニュース About Coronavirus Disease 2019 (COVID-19) https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.who.int/docs/default-source/coronaviruse/who-china-joint-mission-on-covid-19-final-report.pdf&ved=2ahUKEwjEoPzVgvrnAhUDa94KHRXFDmsQFjAAegQIBxAC&usg=AOvVaw1gO_RTfaIWQuEkjdvq_O7i&cshid=1583091585580