<human>:  When did the 1918 Flu Epidemic start and when did it end?
<bot>: The flu started in October 1918 and ended in June 1919. It was caused by a virus that is still present in pigs, birds, and wild animals. It is not a new virus, but a mutated version of the 1918 virus that was released into the world during the war. The flu killed an estimated 50 million people worldwide.