Basic purpose of this lecture is to present on Diseases: How they affect us. Disease are acquired by: Genetic causes – inherited from parents; Microbes – infection from a virus, bacteria or fungus and Parasites – catch an organism that causes disease condition – e.g. malaria. The term disease broadly refers to any condition that impairs the normal functioning of the body. For this reason, diseases are associated with dysfunctioning of the body’s normal homeostatic process.