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Infection is the invasion of an organism's body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to these organisms and the toxins they produce.〔(Definition of "infection" from several medical dictionaries ) - Retrieved on 2012-04-03〕 Infectious disease, also known as transmissible disease or communicable disease, is illness resulting from an infection. Infections are caused by infectious agents including viruses, viroids, prions, bacteria, nematodes such as parasitic roundworms and pinworms, arthropods such as ticks, mites, fleas, and lice, fungi such as ringworm, and other macroparasites such as tapeworms and other helminths. 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. Specific medications used to treat infections include antibiotics, antivirals, antifungals, antiprotozoals, and antihelminthics. Infectious diseases resulted in 9.2 million deaths in 2013 (about 17% of all deaths). The branch of medicine that focuses on infections is referred to as Infectious Disease. ==Classification== Bacterial infections are classified by the causative agent, as well as the symptoms and medical signs produced. Symptomatic infections are ''apparent,'' whereas an infection that is active but does not produce noticeable symptoms may be called ''inapparent,'' ''silent,'' ''subclinical'' or occult. An infection that is inactive or dormant is called a ''latent infection''. A short-term infection is an ''acute'' infection. A long-term infection is a chronic infection. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「infection」の詳細全文を読む スポンサード リンク
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