Potential answers for "Supplementary vaccine offered since 2021"

⭐⭐⭐⭐ COVIDBOOSTER
⭐⭐⭐ BOOSTER
⭐⭐⭐ OSHA
⭐⭐ ADDL
⭐⭐ AUX
⭐⭐ ACCESSORY
⭐⭐ ADDENDA
⭐⭐ EXTRA
⭐⭐ ACCESSORIAL
⭐⭐ SIDE

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