Infectious Disease

Infectious Disease

Infectious diseases, also known as transmissible diseases or communicable diseases comprise clinically evident illness (i.e., characteristic medical signs and/or symptoms of disease) resulting from the infection, presence and growth of pathogenic biological agents in an individual host organism. In certain cases, infectious diseases may be asymptomatic for much or even all of their course in a given host. In the latter case, the disease may only be defined as a "disease" (which by definition means an illness) in hosts who secondarily become ill after contact with an asymptomatic carrier. An infection is not synonymous with an infectious disease, as some infections do not cause illness in a host.

Infectious pathogens include some viruses, bacteria, fungi, protozoa, multicellular parasites, and aberrant proteins known as prions. These pathogens are the cause of disease epidemics, in the sense that without the pathogen, no infectious epidemic occurs.

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. Transmission of pathogen can occur in various ways including physical contact, contaminated food, body fluids, objects, airborne inhalation, or through vector organisms.

Infectious diseases are sometimes called "contagious" 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. Other types of infectious/transmissible/communicable diseases with more specialized routes of infection, such as vector transmission or sexual transmission, are usually not regarded as "contagious," and often do not require medical isolation (sometimes loosely called quarantine) of victims. However, this specialized connotation of the word "contagious" and "contagious disease" (easy transmissibility) is not always respected in popular use.

Read more about Infectious Disease:  Classification, Transmission, Prevention, Diagnosis, Epidemiology, History, Society and Culture

Other articles related to "infectious disease, diseases, infectious diseases, disease":

CIA Transnational Health And Economic Activities - Intelligence Key Judgments On The Global Infectious Disease Threat - Regional Trends - Impact Within The United States
... Although the infectious disease threat in the United States remains relatively modest as compared to that of noninfectious diseases, the trend is up ... Annual infectious disease-related death rates in the United States have nearly doubled to some 170,000 annually after reaching an historic low in 1980 ... Many infectious diseases—most recently, the West Nile virus—originate outside U.S ...
Roy M. Anderson - Biography - Career
... Wellcome Centre for the Epidemiology of Infectious Disease ... agency committees advising on public health and disease control including the World Health Organisation and UNAIDS ... After that, he returned to his Chair in Infectious Disease Epidemiology at the Department of Infectious Disease Epidemiology at Imperial College London ...
Infectious Disease - Society and Culture
... this may ultimately be due to male infants having increased mortality from infectious diseases ...
Gregory J. Martin - Biography
... And he completed an Infectious Disease Fellowship at the National Naval Medical Center between 1991 and 1993 ... attacks as well as his role as the on-site infectious disease physician on Capitol Hill during the attacks and the treatment of the staff of Senator Tom Daschle in the aftermath of ... investigator for the anthrax vaccination protocol set up by the Centers for Disease Control following the attacks, he is also the lead author of a study of the clinical and immunologic responses to ...
Centre For Infectious Disease Research In Zambia
... The Centre for Infectious Disease Research in Zambia is a non-profit organization established by faculty and students from the University of Alabama at Birmingham (UAB) in 1997, and formally ... CIDRZ was originally created as an infectious disease and maternal-child health research unit ... CIDRZ is "to improve lives and communities through research, disease prevention and treatment, and HIV/AIDS care" Most of CIDRZ expatriate faculty are now affiliated with the ...

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