#Didyouknow that researchers in the 1940's began to develop the first flu vaccine with support from the US Army, after the Army faced troop loss from flu illness and deaths during WWI. Their vaccine used fertilized chicken eggs in a method that is still used to produce most flu vaccines today. #FIMEShow #FIME2020 #didyouknowWednesday #FIMEDidYouKnowWednesday #flu #vaccine #flushot