European Union regulators warned that frequent Covid-19 booster shots could adversely affect the immune system and may not be feasible.
Repeat booster doses every four months could eventually weaken the immune system and tire out people, according to the European Medicines Agency. Instead, countries should leave more time between booster programs and tie them to the onset of the cold season in each hemisphere, following the blueprint set out by influenza vaccination strategies, the agency said.
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