Studies from GB and Japan show a high statistical correlation between recent (within 30 days) and sudden onset of pmr. ( See articles on pubmed). Unfortunately, the US does not have a formal process for tracking adverse events associated with covid vaccinations, so there are no US based reports. My 77 year old brother (who is an MD) experienced a sudden onset on an auto-immune disease this summer, within 2 weeks of vaccination. Both my brother and his internal med doc believe that the disease was caused by the vaccination. I live in a different state and had a similar experience- covid vaccine on Oct 10 and sudden (overnight) onset of PMR on Oct. 22