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Chicken egg yolk-derived immunoglobulin Y (IgY) antibodies offer unique conceptual and practical advantages. This review critically evaluates IgY antibodies (IgY-Abs) as a One Health immunotherapeutic strategy with strong potential for mitigating zoonotic spillover risks. Drawing on insights from SARS-CoV-2, we highlight the advantages of IgY-Abs over traditional approaches in specific scenarios while emphasizing their role as a complementary rather than replacement platform within the broader passive immunotherapy landscape. We discuss key strategic considerations, regulatory challenges, and essential knowledge gaps. 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