![]() ![]() COVID-19 has become an urgent and serious global public health crisis.Īs a new infectious disease in humans caused by severe acute respiratory syndrome coronavirus 2 (SARS-COV-2), COVID-19 is characterized by respiratory symptoms and human-to-human transmission. As of April 29, 2020, 2,995,758 cases of infection and 204,987 deaths were reported worldwide. The number of cases of COVID-19 increased rapidly worldwide over the next few months, and the WHO announced a pandemic on Ma. ![]() In December 2019, cases of pneumonia with unknown cause, which was designated the coronavirus disease (COVID-19) in February by the World Health Organization (WHO), were reported in Wuhan, Hubei Province, China. ![]()
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