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( Infectious disease) An infectious disease is a clinically evident disease resulting from the presence of pathogenic microbial agents, including pathogenic viruses, pathogenic bacteria, fungi, protozoa, multicellular parasites, and aberrant proteins known as prions. These pathogens are able to cause disease in animals and/or plants.

Infectious pathologies are usually qualified as contagious diseases (also called communicable diseases) due to their potentiality of transmission from one person or species to another.^[1] Transmission of an infectious disease may occur through one or more of diverse pathways including physical contact with infected individuals. These infecting agents may also be transmitted through liquids, food, body fluids, contaminated objects, airborne inhalation, or through vector-borne spread.^[2]

The term infectivity describes the ability of an organism to enter, survive and multiply in the host, while the infectiousness of a disease indicates the comparative ease with which the disease is transmitted to other hosts.^[3] An infection however, is not synonymous with an infectious disease, as an infection may not cause important clinical symptoms or impair host function.^[2]

Among the almost infinite varieties of microorganisms, relatively few cause disease in otherwise healthy individuals.^[4] Infectious disease results from the interplay between those few pathogens and the defenses of the hosts they infect. The appearance and severity of disease resulting from any pathogen depends upon the ability of that pathogen to damage the host as well as the ability of the host to resist the pathogen. Infectious microorganisms, or microbes, are therefore classified as either primary pathogens or as opportunistic pathogens according to the status of host defenses.

Infectious disease Subcategories Disease and Healing Protocols > > Infectious disease Articles Information on tularemia-an infectious disease by Peter Hutch Tularemia is a rare infectious disease that can attack the skin, eyes and lungs. Fewer than 200 cases of tularemia are reported annually in the United States — mainly in western and south-central states. Tularemia spreads to humans through se... Alternative Medicines - Treatment for Infectious Diseases by Peter Hutch An infectious disease is a disease or sickness that happens when an organism (a living thing such as a plant or animal) is attacked by a pathogen. Pathogens (such as bacteria, viruses, and other germs) are too small to see. Some infectious diseases a... Alternative Medicines For Infectious Diseases by Juliet Cohen An infectious disease is a disease or sickness that happens when an organism (a living thing such as a plant or animal) is attacked by a pathogen. Pathogens (such as bacteria, viruses, and other germs) are too small to see. Some infectious diseases a... The Immune Enhancing Effects of Tea. Theanine by Dr. Stephen Martin Copyright 2006 Grouppe Kurosawa Mammals have two largely independent immune systems in their bodies. Although these immune systems do interact, they serve two very different roles in protecting us against pathogens, including cancer and infecti... Bird Flu: Tamiflu and Relenza for Prevention and Treatment by bradford frank According to a recent report on influenza in the Journal of Virology, “Although vaccination is the ideal way to reduce the interspecies spread of influenza viruses, the preparation of a new vaccine takes six months or more. In the interim, antiviral... Effect of treating periodontitis on C-reactive protein levels: a pilot study Effect of treating periodontitis on C-reactive protein levels: a pilot study Kimmo Mattila1 , Marja Vesanen2 , Ville Valtonen1 , Markku Nieminen1 , Timo Palosuo3 , Vesa Rasi4 Autoimmune inflammatory disorders, systemic corticosteroids and pneumocystis pneumonia: A strategy for prevention Autoimmune inflammatory disorders, systemic corticosteroids and pneumocystis pneumonia: A strategy for prevention Evin Sowden and Andrew J Carmichael Department of Dermatology, The James Cook University Hospital, Marton Road, ... Micronutrient malnutrition and wasting in adults with pulmonary tuberculosis with and without HIV co-infection in Malawi Micronutrient malnutrition and wasting in adults with pulmonary tuberculosis with and without HIV co-infection in Malawi Monique van Lettow1 , Anthony D Harries2 , Johnny J Kumwenda3 , Ed E Zijlstra3<...