- is the smallest type of parasite that exist
-it is also a viral particle or virion contains a single nucleic acid (RNA or DNA) core surrounded by a protein coat and sometimes enzymes that are required to initiate viral replication.
- can only replicate within the cells of animals, plants, and bacteria and, as such, are referred to as obligate intracellular parasites.
-are not classified according to the illnesses they cause; instead, they are grouped into different families based on whether the nucleic acid is single- or double-stranded, whether a viral envelope is present and their mode of replication.
-it can also be seen or not
-it can be deadly or not
-it can help you in your life or not
that is virus..no one can tel what is the virus present around you.
