A fully formed infectious virus particle that is able to establish an infection in a host cell is often called VIRION. It is a fundamental full component of a virus.
A virion can be defined as an entire virus composed of a surface (protein shell) which is called capsid, and the inside nucleic acid.
The core nucleic acid of a virion can be either DNA or RNA (both single and double-strand).
A virion may infect a particular host cell to produce disease.
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