Search results
Results from the WOW.Com Content Network
Sickness behavior is a motivational state that reorganizes the organism's priorities to cope with infectious pathogens. [8] [9] It has been suggested as relevant to understanding depression, [10] and some aspects of the suffering that occurs in cancer.
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.
[[Category:Infectious disease templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Infectious disease templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
Infectious diseases are sometimes called contagious diseases when they are easily transmitted by contact with an ill person or their secretions (e.g., influenza). Thus, a contagious disease is a subset of infectious disease that is especially infective or easily transmitted. All contagious diseases are infectious, but not vice versa.
The International Classification of Diseases (ICD) is a globally used medical classification used in epidemiology, health management and for clinical purposes. The ICD is maintained by the World Health Organization (WHO), which is the directing and coordinating authority for health within the United Nations System . [ 1 ]
Most are non-infectious, although there are some non-communicable infectious diseases, such as parasitic diseases in which the parasite's life cycle does not include direct host-to-host transmission. The four main NCDs that are the leading causes of death globally are cardiovascular disease, cancer, chronic respiratory diseases, and diabetes.
Immunocompromised individuals are especially vulnerable to bacteria that are typically nonpathogenic; because of a compromised immune system, disease occurs when these bacteria gain access to the body's interior. Genes have been identified that predispose disease and infection with nonpathogenic bacteria by a small number of persons. [3]
The first major immunologic model was the Self/Non-self Model proposed by Macfarlane Burnet and Frank Fenner in 1949 with later refinement by Burnet. [ 1 ] [ 2 ] It theorizes that the immune system distinguishes between self, which is tolerated, and non-self, which is attacked and destroyed.