I don't know. I always get the flu vaccine. It's not really something I question anymore. As soon as this vaccine is available for my group, I will get it. If you're nervous, I suggest researching how it was developed. Vaccine technology has come a long way in the past few decades. Turns out the development phase is pretty quick, it's the trial phase that still takes a set amount of time. I think they had vaccine candidates as early as last spring.