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Infections can be caused by a wide range of pathogens, most prominently bacteria and viruses.[2] 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.

Specific medications used to treat infections include antibiotics, antivirals, antifungals, antiprotozoals,[3] and antihelminthics. Infectious diseases resulted in 9.2 million deaths in 2013 (about 17% of all deaths).[4] The branch of medicine that focuses on infections is referred to as infectious diseases.[5]