Infectious Disease, A disease that can be spread from one organism to another and is caused by a pathogen., Non-infectious Disease, A disease that is not caused by pathogens. It is caused by genetics, the environment and/or malfunctions within cells., Virus, An infectious agent that can only replicate within a host organism., Bacteria, Microscopic, single-celled organisms. While a small fraction cause diseases, the vast majority are harmless. or highly beneficial,, Pathogen, Any biological agent—such as a virus, bacterium, fungus or parasite - that causes disease in its host., Protozoa, Single-celled microorganisms, some are parasitic and can cause diseases.

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