Ian Barr

Deputy director at the WHO Collaborating Centre for Reference and Research on Influenza at the Peter Doherty Institute, and a virologist involved in global influenza strain selection.

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Nov 27, 2025 • 27min

The 40 scientists who decide which flu shot you'll get

Ian Barr, a leading virologist and Deputy Director at the WHO Collaborating Centre for Reference and Research on Influenza, reveals the intricate process behind flu vaccine strain selection. He shares insights on how 40 scientists meet biannually to decide which strains to target, the role of hemispheric interactions in flu patterns, and how emerging variants complicate decisions. Barr also discusses the future of vaccines, including advancements in mRNA technology, and addresses the rise of vaccine hesitancy post-COVID.

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