COVID-19, which is also called novel coronavirus, is the respiratory infectious disease caused by the SARS-CoV-2(Severe acute respiratory syndrome coronavirus 2). After it was first reported from Wuhan, China in December 2019, it spread rapidly all over the world. As yet there is no vaccine and no medicine to prevent or to treat COVID-19, so this outbreak is affecting countries worldwide. On March 11, the World Health Organization (WHO) declared COVID-19 a global pandemic, which means that this infectious disease has spread worldwide at the same time.
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