Virus, Viroid &prions
Virus generally intracellular parasites the infect the living cell and cause disease towards the affected living organism. These are made of both DNA and RNA. Viroid are tiny particles than virus which doesn’t have a capsid and has a coiled naked RNA that affect the cell. Viroid infections are mostly caused by the cross contamination that caused the mechanical damages, while prions are the misfolded form of a normal protein found in a cell. Prions play a major role in the neurodegenerative disorders in humans and animals.