Science Missions: Developing Flu Vaccines

World War I lasted from 1914 until 1918. A shocking 15 million soldiers died. But in 1918, a deadly flu spread across the world. The Spanish Flu killed at least 40 million people in half of the time. Although there hasn't been anything nearly as devastating as the Spanish Flu since then, new flu viruses are reported each year. Most aren't usually threatening, but they certainly can be. Doctors and scientists are always trying to come up with new vaccines to protect against these new viruses. Will a universal flu vaccine ever be possible?