COVID-19 Vaccine Effectiveness of Booster Doses Against Delta and Omicron Variants Over Follow-up Times Using Longitudinal Meta-analysis

Farideh Mostafavi ^1,2 , Mansour Bahardoust ^1,2, Francesco Sera ³, Alireza Amirabadizadeh ⁴, Sepehr Allahyari ⁵, Paddy Ssentongod ⁶, Manochehr Karami ², Seyed Saeed Hashemi Nazari ² *

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