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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.
Infectious diseases are historically associated with hygiene and epidemiology due to periodic outbreaks ravaging countries, especially in the cities before the advent of sanitation, but also with travel medicine and tropical medicine, as many diseases acquired in tropical and subtropical areas are infectious in nature.
A contagious disease is an infectious disease that can be spread rapidly in several ways, including direct contact, indirect contact, and Droplet contact. [1] [2] These diseases are caused by organisms such as parasites, bacteria, fungi, and viruses. While many types of organisms live on the human body and are usually harmless, these organisms ...
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.
Infectious diseases are diseases caused by biological agents, which can be transmitted to others, rather than by genetic, physical or chemical agents. This definition includes disease caused by viruses , bacteria , parasites , fungi and prions .
Peter Chin-Hong, an infectious disease specialist at UC San Francisco, said people should be on the lookout for the "Big Four": three respiratory viruses currently moving through the U.S ...
Diseases and disorders VACTERL-H Vertebral abnormalities, Anal atresia, Cardiac defects, Tracheoesophageal fistula, Esophageal atresia, Renal and radial abnormalities, Limb abnormalities with Hydrocephalus VAED Vaccine-associated enhanced disease VCFS Velo cardio facial syndrome: vCJD variant Creutzfeldt–Jakob disease: VD Venereal disease: VHF
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1 ] Examples are the common cold , gastroenteritis and pneumonia .