Label the principal events of attachment, biosynthesis, entry, and maturation of a + stranded RNA virus. Draw in uncoating.

Attachment is the initial step where the virus binds specifically to receptors on the host cell surface. This interaction determines host range and tissue tropism, enabling the virus to recognize and attach to susceptible cells before entry.

Entry involves the virus penetrating the host cell, often via endocytosis or membrane fusion. Uncoating follows, where the viral capsid is removed to release the viral RNA genome into the cytoplasm, making it accessible for replication and translation.

Biosynthesis includes replication of the viral RNA and translation of viral proteins using host machinery. Maturation is the assembly of new viral particles from synthesized components, preparing them for release to infect new cells.