Guidance

Emerging infections: characteristics, epidemiology and global distribution

Information on the reasons behind human infectious disease emergence, including a timeline and a global map.

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Many (60 to 80%) emerging infections are derived from an animal source. Infectious disease emergence can be viewed as a two-step process:

  1. introduction of the agent into a new host population, followed by

  2. establishment and further dissemination within the new host population

See timeline of disease emergence since 1998

See global map of disease emergence since 1998

Published 12 February 2018
Last updated 27 February 2019 + show all updates
  1. Updated the emerging infections timeline and global map.
  2. First published.