In December 2019 unexplained pneumonia cases were initially reported in Wuhan, China. The pathogen, a novel coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was isolated from lower respiratory tract samples of infected patients and the resultant disease was termed as COVID-19 (Coronavirus Disease 2019)(1) . By Feb 15, COVID-19 has rapidly spread throughout China and across the world, until a pandemic condition was announced by March 11(2) .
year โฐ 2020
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