Bacteria - Microscopic, single-celled organisms that come in various shapes and sizes, Virus - Tiny infectious agents that can only replicate inside the cells of living organisms, Fungi - Have a thick cell wall which makes them difficult to eradicate, Endoparasite - A parasite which lives in the host's body, Ectoparasite - A parasite which lives on the outside of the host's body, Parasite - Lives in or on a host and feeding from it, Protozoa - Single celled organism which can live and multiply in a host's body,

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