“The authors warned that if booster shots are introduced too soon, they may cause more side effects in the general population, including myocarditis or Guillain-Barre syndrome. Should that occur, the researchers said, it would create even more problems with vaccine acceptance in the general population.”

https://www.theepochtimes.com/mkt_breakingnews/fda-leaders-other-scientists-say-most-people-dont-need-vaccine-boosters_3994852.html?