
An emerging infectious disease (EID) is an infectious disease whose incidence has increased in the past 35 years and could increase in the near future. Emerging infections account for at least 12% of all human pathogens. EIDs are caused by newly identified species or strains (e.g. SARS, AIDS) that may have evolved from a known infection (e.g. infl...
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http://en.wikipedia.org/wiki/Emerging_infectious_disease

Emerging infectious disease: An infectious disease that has newly appeared in a population or that has been known for some time but is rapidly increasing in incidence or geographic range. Examples of emerging infectious diseases include: Ebola virus (first outbreaks in 1976 and the discovery of the virus in 1977), HIV/AIDS (virus first isolated in ...
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http://www.medterms.com/script/main/art.asp?articlekey=22801

a disease that is new to the human population or has increased in prevalence over the previous 20 years
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
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