Hi . As noted in this article, "The American College of Rheumatology issued guidance regarding COVID-19 vaccination on Feb 8, 2021, and acknowledged a theoretical risk of flare of autoimmune disease after vaccination with moderate consensus:" https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8009616/. The article presents a case study where the individual had such a flare, but the flare occurred 12 hours after the second vaccination. This more recent article discusses a couple of studies on the topic of RA flares after the vaccine, including one that found this to occur in about 5% of cases. It is not specified, however, how soon the flares occurred, but I highly suspect they were looking at a shorter time frame than you describe. Trials usually operate on a shorter time-line in initial side effect reporting. This, of course, is not to say that the vaccine could not have played a part in your flare. It was a change for your system that involved the immune system, so the exact impact on your autoimmune condition is an unknown. I know this is an unsatisfying answer, but the most important thing now is to try to get your RA back under control. Has your doctor discussed any treatment beyond the steroids? Please feel free to keep us posted on how you are doing. wishing you the best. Richard (RheumatoidArthritis.net Team)