Infection
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. An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection.
Infections can be caused by a wide range of pathogens, most prominently bacteria and viruses. Hosts can fight infections using their immune systems. Mammalian hosts react to infections with an innate response, often involving inflammation, followed by an adaptive response.
Treatment for infections depends on the type of pathogen involved. Common medications include:
Antibiotics for bacterial infections.
Antivirals for viral infections.
Antifungals for fungal infections.
Antiprotozoals for protozoan infections.
Antihelminthics for infections caused by parasitic worms.
Infectious diseases remain a significant global health concern, causing approximately 9.2 million deaths in 2013 (17% of all deaths). The branch of medicine that focuses on infections is referred to as infectious diseases.
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