 The entry and uncoating of the virus begins when the virion attaches to cell receptors on the surface of the host cell, which then brings in the virus via endocytosis.By a process called pH-dependent fusion between the virion and the endosomal membrane, nucleocapsids enter the cytoplasm.The virus genome contains its own RNA-dependent RNA polymerase (RdRp) which directs both transcription and replication of the viral genome.