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The agent responsible for the epidemic that first appeared in Wuhan, China, in December 2019 was detected to be the new coronavirus (2019-nCoV). Later, the virus that caused respiratory tract infection was discovered to be a member of the beta-coronavirus family, it was named as severe acute respiratory syndrome-CoV2 (SARS-CoV 2), and the disease it caused was called CoV infection disease-19 (COVID-19). The epidemic started in China, spread rapidly first to East Asian countries, then Europe and America, affected the whole world, and was declared a pandemic by the World Health Organization. This review presents an overview of SARS-CoV2 and aims to examine its intracellular pathogenesis and host immune responses.