The Spanish Flu pandemic killed 30-50 million people in Europe, North America, Africa, Asia and the Pacific, and is lodged in the popular memory of that generation. The chapters in this book have been structured around five main themes to explore the medical and societal ramifications of this disease: the virology of the pandemic, medical responses, official responses, the demographic impact and the long-term effects of the pandemic. The origins of the virus, the global spread, impact and consequences of the pandemic are all explored in detail.