The Spanish Flu of 1918 killed predominantly the least susceptible age group, which is the ages between 20-40 years old. During this flu epidemic over 50% of its casualties were in this age range. The disease was suspected of using strong cytokine storms to infect over 50% of the population. Unlike other strains of the flu, the Spanish Flu was very fatal. Most flu viruses opened up its victim to secondary infection such as bacterial based pneumonia, which is what causes the virus to be fatal. The Spanish Flu however killed people by causing them to hemorrhage and form edema in the lungs. Following the Spanish Flu, a few other notable epidemics were the 1957 Asian Flu, and 1968 Hong Kong Flu. With the severity of the flu over the years a group of scientists went to find a cure in the year 1944. Although a cure was never found with the help of scientists from year to year and getting your annual flu shot it is possible to combat the influenza