e.g. "At the moment, there is no clear evidence to support giving a second booster dose to people below 60 years of age who are not at higher risk of severe disease. Neither is there clear evidence to support giving early second boosters to healthcare workers or those working in long-term care homes unless they are at high risk."
https://www.ema.europa.eu/en/news/ecdc-ema-update-recommenda...
e.g. "At the moment, there is no clear evidence to support giving a second booster dose to people below 60 years of age who are not at higher risk of severe disease. Neither is there clear evidence to support giving early second boosters to healthcare workers or those working in long-term care homes unless they are at high risk."