COVID-19 has claimed the lives of over 5 million people globally and nearly 750,000 Americans. While questions about its origins still exist, the world has learned a lot about how it evolves, and gained insight into preparing for future pandemics. Judy Woodruff discusses the same with Dr. Sanjay Gupta, author of "World War C: Lessons from the Covid-19 Pandemic and How to Prepare for the Next One."

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