virusy
Virusy are microscopic infectious agents that infect living organisms. They are not considered living organisms by all definitions because they cannot reproduce or carry out metabolism outside a host cell. A typical virusy particle contains genetic material—DNA or RNA—encased in a protein coat called a capsid; many also have a lipid envelope derived from the host cell membrane and proteins that help it enter cells. The genome can be single- or double-stranded, linear or circular, and ranges from a few thousand to more than a hundred thousand nucleotides.
Virusy replicate by invading a host cell and using the cell's machinery to synthesize viral components, which
Classification typically separates virusy by genome type—DNA viruses and RNA viruses—which are further grouped by structure,
Pathogenicity is variable: many virusy cause mild illness or asymptomatic infections, while others can cause severe