That can happen. Parasites which feed on other parasites are called epiparasites or hyperparasites. Examples for that are Ichneumon flies like Pachyneuron minutissimum. Sometimes certain...
A parasite is just a living thing that lives off of something else. To not become one, don't ask too much of this other person. Don't ask for things you don't need like money or a place to live or...
People Infected with malaria carry sporozoans which are parasites. The sporozoans trvel to the liver where another form is made called merozoites. From there the new forms travel through the blood...