what is parasites
Parasites. A parasite is an organism that lives on or in a host and gets its food from or at the expense of its host.Parasites can cause disease in humans. Some parasitic diseases are easily treated and some are not.The burden of these diseases often rests on communities in the tropics and subtropics, but parasitic infections also affect people in developed countries.arasites can cause disease in humans. Some parasitic diseases are easily treated and some are not. The burden of these diseases often rests on communities in the tropics and subtropics, but parasitic infections also affect people in developed countries.