why the downvotes on this comment? iirc the vaccine response was shown to diminish over time and health experts discussed the potential need for covid vaccine b

why the downvotes on this comment? iirc the vaccine response was shown to diminish over time and health experts discussed the potential need for covid vaccine booster shots. a limited timeframe for reinfection poses an issue considering we may never be truly done with this disease as it could recirculate and require frequent shots like the flu