The "difference" between vaccines for polio, measles ect, and Co

Corbin City - The "difference" between vaccines for polio, measles ect, and Covid is these past vaccines were made using a model proven over 100 years the "new" and "improved" vaccine technology is just that, new, and certainly not proven, so thank you to those that had it and by all means report on your health on a regular basis. Thank you