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Anthony Fauci (L) , director of the National Institute of Allergy and Infectious Diseases, and Robert Redfield, director of the U.S. Centers for Disease Control and Prevention, talk as they prepare to testify before the U.S. Senate Committee on Health, Education, Labor and Pensions on COVID-19: Update on Progress Toward Safely Getting Back to Work and Back to School in Washington, D.C., the United States, on June 30, 2020. Anthony Fauci, the U.S. government's top infectious-diseases expert, warned Tuesday that COVID-19 cases in the United States could go up to 100,000 per day if the current trend "does not turn around." (Kevin Dietsch/Pool via Xinhua)