Guidance: Emerging infections: characteristics, epidemiology and global distribution

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 1997

See global map of disease emergence since 1997

from Public Health England - Activity on GOV.UK https://www.gov.uk/government/publications/emerging-infections-characteristics-epidemiology-and-global-distribution
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