The theory tells us that all viruses are obligate parasites, therefore, we can say that there is no virus that is not a parasite.
¿What is a virus?
Biology establishes that viruses are infectious agents that require the cells of other organisms to be able to replicate, in this sense, it is said that viruses are obligate parasites.
It is important to consider that viruses are not living organisms, because they do not develop the three vital functions. Also, considering the characteristics of the virus itself, it is indicated that every virus is a parasite.
¡Hope this helped!