Immune system or the use of immunosuppressive medication. In contrast, autoimmunity results from a hyperactive immune system attacking normal tissues as if they were foreign organisms. Common autoimmune diseases include Hashimoto's thyroiditis, rheumatoid arthritis, diabetes mellitus type 1, and systemic lupus erythematosus. Immunology covers the study of all aspects of the immune system. Immunology is a science that examines the structure and function of the immune system. It originates from medicine and early studies on the causes of immunity to disease. The earliest known reference to immunity was during the plague of Athens in 430 BC. Thucydides noted that people who had
Evolution of Infectious Disease The way a host lives contributes heavily to how their body will react to pathogens. If an organism lives a moderately healthy lifestyle, including their diet, physical activity, and has a decreased amount of stress to deal with, their chances of fighting off infectious diseases increases. Host resistance pivots around how well a host’s immune system can fight off a disease and rid their body of the pathogens. Although a healthy lifestyle can help a host, infectious diseases seem to evolve so quickly that a new generation of a disease may have emerged before scientists have the chance to make