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How close are we to a universal flu vaccine? Are universal corona vaccines attainable? What are some of the main challenges facing scientists in their quest to develop these vaccines? Listen to Dr Florian Krammer, Mount Sinai Professor in Vaccinology at the Department of Microbiology at the Icahn School of Medicine, and ESWI Board Member, expertly addressing these questions. Dr Krammer also vividly describes New York in the first few months of the COVID-19 pandemic and explains how and why he rapidly got thousands of followers on Twitter.