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Health workers walk from house to house during a polio vaccination campaign in Hotoro-Kudu, Nassarawa district of Kano, Nigeria. April 22, 2017. Pius Utomi Ekpei/AFP via Getty Images

The Last Mile: How We’ll Stop All Poliovirus in Africa

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This scanning electron microscope image shows SARS-CoV-2 (round magenta objects) emerging from the surface of cells cultured in the lab. SARS-CoV-2, also known as 2019-nCoV, is the virus that causes COVID-19. The virus shown was isolated from a patient in the U.S. Credit: NIAID-RML

COVID-19 Expert Reality Check

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