Yale study reports chronic symptoms after Covid vaccine.

A small number of people report chronic symptoms after receiving COVID-19 shots. A new study provides clues for further research.

Some of the most common chronic symptoms of PVS include exercise intolerance, excessive fatigue, brain fog, insomnia, and dizziness. They develop shortly after vaccination, within a day or two, can become more severe in the days that follow, and persist over time.

Along with spike protein persistence, the researchers are assessing the contributions of autoimmunity, tissue damage, and Epstein-Barr Virus (EBV) reactivation.
https://news.yale.edu/2025/02/19/immune-markers-post-vaccination-syndrome-indicate-future-research-directions