I have never had the flu, and I had not has the vaccination until I turned 65, since then I have had it every year. The problem is that there are always new strains of the flu and the vaccination may not cover the strain that is about. This in mind I would want to know that the vaccination for COVID19 was going to be effective. I would also want to know if it contains a live virus, which could give you a dose of COVID19, or a killed one which would not give you the virus as a result of having the vaccination.