Virus are tiny organisms that can only replicate inside a living host. It can only reproduce in the living cell of another organism. A virus when outside the living host is called Virion and it contains the genetic materials (DNA or RNA), Capsid. The virus is much more smaller than a bacteria cell.
Source
A lot of diseases are caused by viruses. Examples include AIDS Ebola and so on. Virus structure can be helical, icosahedral, complex or enveloped.
Posted on HEDE - A dictionary for sharing knowledge in a friendly way
I know this . this is T2 fas virus