" The Purple Death was actually part of a great wave of influenza, a lethal virus that swept across America and around the world starting in the spring of 1918. A second, even deadlier wave of influenza appeared in late summer and autumn of 1918, and a third wave continued into 1919. This highly contagious disease, later widely known as Spanish flu, killed an estimated 675,000 Americans in one year, according to historian and professor Alfred Crosby. Consider this perspective: more Americans died from the flu in this short time than all the U.S. soldiers who died fighting in World War I, World War II, the Korean War, and the Vietnam War combined. Indeed, the Spanish flu killed as many Americans in about a year as did HIV/AIDS, the most notorious epidemic of modern times, in more than thirty years. According to the Centers for Disease Control and Prevention (CDC), the estimated number of deaths from diagnosed HIV infection classified as AIDS in the United States since the first reported death in 1981 through 2014 was 678,509—about the same number that died of Spanish flu from 1918 to 1919. "

― Kenneth C. Davis , More Deadly Than War: The Hidden History of the Spanish Flu and the First World War