Infection is the invasion of a host organism's bodily tissues by disease-causing organisms, their multiplication, and the reaction of host tissues to these organisms and the toxins they produce. Infections are caused by microorganisms such as viruses, prions, bacteria, and viroids, and larger organisms like macroparasites and fungi.

Hosts can fight infections using their immune system. Mammalian hosts react to infections with an innate response, often involving inflammation, followed by an adaptive response. Pharmaceuticals can also help fight infections.

The branch of medicine that focuses on infections and pathogens is infectious disease medicine.

Read more about Infection:  Classification, Diagnostic Approach, Signs and Symptoms, Pathophysiology, Treatment and Prevention, Fossil Record

Other articles related to "infections, infection":

Ehrlichiosis - Symptoms
... Ehrlichiosis can also blunt the immune system, which may lead to opportunistic infections such as candidiasis ... Early in infection, production of TNF-alpha, a cellular product that promotes inflammation and immune response, is suppressed ... Late in infection, however, production of this substance can be upregulated by 30 fold, which is likely responsible for the "toxic shock-like" syndrome seen in some severe ...
... Dirofilariasis is an infection by parasites in the Dirofilaria genus ... B65–B83, 120–129) Flatworm/ platyhelminth Fluke/trematode (Trematode infection) Blood fluke Schistosoma mansoni/japonicum/mekongi/haematobium (Schistosomi ...
Threshold (TV Series) - The Infection
... The infection can be spread in a multitude of ways from bodlily fluids to sound waves ... Both humans and animals are susceptible to infection and is implied through the show the aliens wish to terraform the whole world to suit their needs ... Infectee Humans who were exposed to the infection and have been converted into "aliens" ...
Magnaporthe Grisea - Management
... In order to most effectively control infection by M ... would be to plant resistant rice varieties that are not as susceptible to infection by M ... to the crops limits spore mobility thus dampening the opportunity for infection ...
Infection - Fossil Record
... Evidence of infection in fossil remains is a subject of interest for paleopathologists, scientists who study occurrences of injuries and illness in extinct ... Signs of infection have been discovered in the bones of carnivorous dinosaurs ... When present, however, these infections seem to tend to be confined to only small regions of the body ...

Famous quotes containing the word infection:

    This royal throne of kings, this sceptred isle,
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    Against infection and the hand of war,
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    William Shakespeare (1564–1616)

    What, then, was war? No mere discord of flags
    But an infection of the common sky
    That sagged ominously upon the earth
    Robert Graves (1895–1985)

    No science is immune to the infection of politics and the corruption of power.
    Jacob Bronowski (1908–1974)