emerging infectious disease

     

An emerging infectious isease (EID) is an infectious disease whose incidence has increased in the past 20 years and threatens to increase in the near future. EIDs include diseases caused by a newly identified microorganism or newly identified strain of a known microorganism (e.g. SARS, AIDS); new infections resulting from change or evolution of an existing organism (e.g. influenza), a known infection which spreads to a new geographic area or population (e.g. West Nile virus), newly recognized infection in an area undergoing ecologic transformation, and pre-existing and recognized infections reemerging due to drug resistance of their agent or to a breakdown in public health (e.g. tuberculosis).

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