The Water Deer (Hydropotes inermis) is a usually solitary animal, besides the rutting months, and a good swimmer. There exist two subspecies: the Chinese Water Deer (Hydropotes inermis inermis) and the Korean Water Deer (Hydropotes inermis argyropus).
Viruses lack most of the internal structure and machinery which characterize 'life', including the biosynthetic machinery that is necessary for reproduction. In order for a virus to replicate it must infect a suitable host cell.
A virus is a non-cellular particle that consists minimally of protein or nucleic acid (DNA or RNA). Except for a few cases, viruses are not surrounded by a membrane. In order to survive, it must replicate inside another cell, such as a bacterium or a plant and animal cell.