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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.
An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. [1] An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection.
A medical condition is a broad term that includes all diseases and disorders.. A disease is an abnormal condition affecting the body of an organism.. A disorder is a functional abnormality or disturbance.
Pathogenic bacteria are bacteria that can cause disease. [1] This article focuses on the bacteria that are pathogenic to humans. Most species of bacteria are harmless and many are beneficial but others can cause infectious diseases.
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 February 2025. Condition negatively affecting an organism For other uses, see Disease (disambiguation). "Maladies" redirects here. For the 2012 film, see Maladies (film). "Malady" redirects here. For the American politician, see Regis Malady. "Ailment" redirects here. Not to be confused with Aliment ...
A staphylococcal infection or staph infection is an infection caused by members of the Staphylococcus genus of bacteria.. These bacteria commonly inhabit the skin and nose where they are innocuous, but may enter the body through cuts or abrasions which may be nearly invisible.
A hospital-acquired infection, also known as a nosocomial infection (from the Greek nosokomeion, meaning "hospital"), is an infection that is acquired in a hospital or other healthcare facility. [1]
Malaria is a mosquito-borne infectious disease that affects vertebrates and Anopheles mosquitoes. [6] [7] [3] Human malaria causes symptoms that typically include fever, fatigue, vomiting, and headaches.