They both destroy the cells that they attack.
Parasites can carry and transmit viruses, but they do not "cause" them.
Viruses
No; viruses are sub-Cellular 'virons', while parasites are frequently multi-cellular organisms.
viruses are considered parasites (obligate parasites) because they cannot exist on their own. they need the host cell's machinery to reproduce so they cannot "survive" (technically not living) outside the cell.
bacteria, viruses, fungi and parasites
Immunity
Because viruses can not reproduce or produce protein without a host cell
no. . . Because parasites and viruses can only grow on living matters... There may be saprophytes and bacteria growing in your food. . . Even parasites and viruses can be there but can not grow. .
bacteria. viruses. fungi. protozoa .(protists). parasites.
the only thing viruses have in common with them is that they move
No; leeches aren't vectors of dog true parasites but they can still infect them with other microorganisms like viruses.
Tapeworms, fleas, leeches, and most viruses, and some bacteria all fall under the label of parasites. Parasites benefit from another organism at that organism's expense.