virusai
Virusai refer to viruses in some languages and, more broadly, to viruses as a group of infectious agents. They are submicroscopic and composed of genetic material—DNA or RNA—encased in a protein coat called a capsid, and sometimes surrounded by a lipid envelope. Virusai are obligate intracellular parasites: they cannot carry out metabolism or replicate outside a living host cell and must hijack host cellular machinery to reproduce.
Virusai vary in size and structure, but share key features. The genome can be double-stranded DNA, single-stranded
Virusai are classified in multiple families and orders, commonly grouped by Baltimore classifications. They can infect