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'Get serious!': See Dr. Fauci dismiss liars attacking him and Bill Gates

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As U.S. Covid-19 cases drop and the vaccine rollout continues, Dr. Fauci outlines the road ahead, why some vaccines "work" to save lives without blocking all transmission, and what it will take to reach herd immunity and a return to normal. He also bluntly dismisses dangerous Covid-19 conspiracy theories circulating online. This is an excerpt from an interview with MSNBC’s Ari Melber.