What time span does GIDEON cover?
GIDEON historical outbreaks data goes back to 1348 AD
Most diseases are covered from the 1920s.
There are smallpox graphs that start in the 1880s to 1890s (Egypt and Japan), and outbreaks are covered from as early as 1348 (plague).
Other diseases with a broad historical coverage include anthrax (1770), botulism (1793), cholera (1832), and dengue (1850).