>>11251992 (PB)
virus has no OS
its is a parasite who uses host OS to replicate
Not necessarily harmful, viruses can modify bio code including germ line code either helpfully or destructively.
Prions are a step down from virus, not only are they not alive, they persuade living proteins to imitate them structurally - and that cause widespread neuron death and the associated brain damage of kuru.
https://pubmed.ncbi.nlm.nih.gov/21527829/