This undated, colorized electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the Novel Coronavirus SARS-CoV-2, indicated in yellow, emerging from the surface of cells, indicated in blue/pink, cultured in the lab. The sample was isolated from a patient in the U.S. On Thursday, April 21, 2022, scientists reported a U.K. patient with a severely weakened immune system had COVID-19 for almost a year and a half, underscoring the importance of protecting vulnerable people from the coronavirus. (NIAID-RML via AP, File)
