Spanish Flu: 100 years since the breakout of a world epidemic
International history has been darkened by several diseases which wiped out swathes of the world's population, one of which was the fatal Spanish flu.
TRAVEL diseases
When Spanish flu broke out in 1918, much of Europe was locked into the bloody battlefields of the First World War. Even though the exact origins of the disease are unknown, it's likely that the trench warfare which kept millions of young men crammed in such close quarters together helped it spread. Scroll through the gallery to learn more about the epidemic which wiped out almost 5% of the world's population.