does bacteria and virus come under parasitism?


Yes, when bacteria and virus infect an organism and cause harm to it, in that case they are known as parasites and they follow the parasitic mode of nutrition. 

Parasitism is a relationship between two organisms in which one is benefited and the other one is harmed. The organism that is benefited is called parasite and the one that is harmed is called host.

Endoparsaites are the parasites that live inside the body of host. For example, Ascaris.
Ectoparsaites are the parasites that live outside the body of host. For example, Lice.

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