1. the improper functioning of the body brought about by heredity, infection, diet, or the environment Â
disease Â
2. cannot be spread through contact or any mechanism of transmission Â
non - infectious disease
3. caused by the spread of harmful microorganisms Â
infectious disease Â
4. caused by the multiplication of a small infectious agent which invades a host cell and then destroys it Â
viral infection Â
5. caused by the reproduction of a small infectious agent which produces poisons that destroy cells Â
bacterial infection Â
6. caused by the multiplication of fungal organisms on or in the body Â
fungal infection Â
7. caused by microscopic parasites Â
protozoan infection