Spanish flu apparently raged through Europe. The Allies of World War I called it the "Spanish Flu". This was mainly because the pandemic received greater press attention in Spain than in the rest of the world, because Spain was not involved in the war and there was no wartime censorship in Spain. Although the virus certainly did not originate in Spain, the country did have one of the worst early outbreaks of the disease, with some 8 million people infected in May 1918. It was also described as only "the flu" or "la grippe" by public health officials seeking to prevent panic. The social effects were intense due to the fast spread of the pandemic. Global mortality rate from the flu was estimated at 2.5% – 5% of the human population, and 20% of world population suffering from the disease to some extent. It spread across the world killing 25 million during six months; some estimates put the total killed at over twice that number, possibly even 100 million. An estimated 17 million died in India, about 5% of India's population at the time. In Britain 200,000 died; in France more than 400,000. The death rate was especially high for indigenous peoples; entire villages perished in Alaska and southern Africa. In the Fiji Islands, 14% of population died during only two weeks, and in Western Samoa 22%. In Japan, 257,363 deaths were attributed to influenza by July 1919, giving an estimated 0.425% mortality rate, much lower than nearly all other Asian countries for which data are available. CNN.com reported that historian John Barry wrote in his book "The Great Influenza" that Bayer aspirin was just hitting the market in the US at the time of the Spanish flu, but because Bayer was a German company and World War I was happening, many Americans distrusted it and thought that it was a form of germ warfare. It was reported that Barry further related in his book that this theory was even suggested by US government officials.
(Source: Wikipedia)
On a side note, The Duchess of Connaught, née Princess Luise of Prussia, died of Spanish Influenza in 1917. Hope it helps. Even a bit...