Well because I am type II diabetic, have asthma, had a heart attack 9 years ago, have congestive heart failure, and rhumatoid arthritis, I took the shot as a precaution. I didn't have Covid antibodies before the shot, and now I do.
Israel did an extensive study of their population. Hasidic Jewish men and women, regular Jewish men and women, Muslim men and women in their country. Those who got covid the most were Muslim women. They found out Muslim women had real low levels of vitamin D because they are always covered up outside. They said those who had 6,000 or 7,000 units of vitamin D hardly ever got Covid.
Then they treated it with Ivermectin and Zinc. At first they treated it with Hydroxychloriquinine and Zinc. (50 units of zinc daily). Either kills the Covid virus and you don't get antibodies. I think this is one reason they didn't want to actually treat it. They wanted people to get herd immunity so they wouldn't have to treat everyone.
I did read that the Covid vaccine can actually keep you from getting a cold and the Pfizer vaccine (which my wife and I took) is good against the mutated strains that are coming out from Brazil and Europe.