Nobody really knows do they. I had the China Virus and do not want it again. I had my first shot without any after effects. My 2 sisters, my brother and their spouses have had 2 of the Pfizer shots without any after effects at all. I did have my anti bodies checked yesterday and was told I had as many as anybody that they have checked. I will put off my second shot until or after my anti body count gets low. Nobody definitely knows how long that I'll be immune from having the China or how long my shot will help. Yes I get a flu shot every year, shingles, and am up to date on all others.
If some of you don't want the shot, that is your decision and not anybody else's..