Parasites that use only a single host species in their life are called monoxenic; those with multiple hosts are called heteroxenic. ... intermediate hosts are all the others. Paratenic hosts are hosts that are used only for transport; no life cycle stages are completed within the host.
A parasite like a mosquito only has to bite someone for them to be infected or harmed. They can bite as many people as they want or need in order to survive.
