What are the examples of a primary host?

A primary host is an organism that harbors a parasite during its adult or sexually reproductive stage. Examples include humans as primary hosts for the malaria parasite (Plasmodium) and dogs for the tapeworm (Echinococcus). Other examples are cattle as primary hosts for the liver fluke (Fasciola hepatica) and birds for various species of ticks. In these cases, the primary host plays a crucial role in the life cycle of the parasite.