I don't know where your definition of parasite has come from but I've never heard it. Also, it's not universally agreed upon whether viruses are living or non-l

I don't know where your definition of parasite has come from but I've never heard it. Also, it's not universally agreed upon whether viruses are living or non-living (dead is the incorrect term). Parasite: an organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other's expense. Sounds like a virus to me.