Effectiveness, Safety, and Immunogenicity of a Second COVID‐19 Vaccine Booster in the Elderly: A Systematic Review and Meta‐Analysis Protocol
Older adults remain highly vulnerable to severe COVID‐19 outcomes due to immunosenescence and comorbidities. Although booster vaccination strategies have reduced hospitalizations and mortality, evidence regarding the effectiveness, safety, and immunogenicity of a second COVID‐19 vaccine booster dose in older adults rem...