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Johann Greffrath is a clinical researcher specializing in infectious diseases and vaccine development, with a strong focus on SARS-CoV-2 immunization strategies. His work has contributed to pivotal multicenter trials evaluating the safety, efficacy, and immunogenicity of viral vector and mRNA COVID-19 vaccines across diverse populations in Europe, Africa, and Latin America.
His research centers on immunobridging studies, variant-adapted vaccine design, and optimization of prime–boost intervals. Publications in leading journals highlight involvement in landmark analyses of the ChAdOx1 nCoV-19 vaccine, including pooled efficacy data and investigations into dosing schedules that informed global vaccination policies during the pandemic.
Greffrath has also advanced understanding of cellular immune responses, examining T-cell reactivity in individuals with and without HIV and exploring hybrid immunity following infection and vaccination. Collectively, his contributions strengthen evidence-based vaccine deployment strategies and support adaptable responses to emerging viral variants.
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