Quite right, I don't have any issues with Polio or yellow fever vaccines because those vaccines have been around for a long time, we know them well, we know they are effective and safe but the civid vaccines were only released less than 2 years ago so we don't know all the side effects of these vaccines, and many instances of side effects and adverse reactions have been reported despite the medical experts saying that these effects are 'rare' or 'low risk'.