The Spanish was an extremely deadly flu pandemic, which killed millions of people around the world between 1918 and 1920, even in the remote islands of the Pacific Ocean and the Arctic Ocean. It infect about 500 million people worldwide, causing death of about 50-100 million (from 3 to 5% of the world's population at the time). This level of lethality means that Spanish Fever is still considered the most serious form of pandemic in the history of mankind. Although the origin of the pandemic is still highly debated, it is a fact that the constraint of millions of men in limited and shared spaces during the First World War and the precarious living conditions caused by the conflict contributed enormously to the spread of the disease.
Spanish influence: the plague of the twentieth century