Just sharing this - a close friend is an infectious disease specialist. He's in his late 60s, no autoimmune disorder and not taking an immunosuppressant drugs, like Prednisone. He told me he's not going to eat at any indoor restaurants until the Delta variant calms down. He advised me to eat outdoors in restaurant venues and not have contact with people who have not been vaccinated. Currently, in our state there's an uptick in COVID cases of the unvaccinated, particularly children. We do not know, at this point, if being on prednisone lessens the efficacy of the vaccines, but it may be wise to assume it does. Currently some studies are underway - of specific patient groups with autoimmune disorders on immunosuppressant drugs to see if they develop neutralizing antibodies after 2 doses and if they don’t whether a 3rd booster would help. Not a bad idea to be cautious and consider how you can meet with your grandchildren safely, particularly if they have not been vaccinated. All the best.