Parasites can be divided into three categories; those which live in your body, those which affect your skin or mucus membranes, and those that are spread from your body to someone else. Parasites live in all mammals, and most have a life cycle that includes sexual reproduction. A parasite is a living thing that is part of the host.
Most parasites are found in the soil, in the air and in the water, but not all are. There are two main kinds; intestinal and parasitic. Bacteria and viruses are parasitic. Most bacteria are parasites, so they are good at growing in a person's digestive tract. Most viral parasites are found in animals. Some viruses cause diseases that are transmitted from one person to another. Most parasitic diseases are contracted by the blood. So it is also very easy for a blood infection to be transmitted by food, water, or air. The parasites on the immune system can also cause diseases and infections. If you are pregnant, it is important to get the parasites out of your body as soon as possible. Parasites can be transferred from a mother to her child and can make them sick or even kill them. It can also take many years to remove them from your body.