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 a laboratory. The National Institutes of Health is opening a handful of studies to start testing possible treatments for long COVID, an anxiously awaited step in U.S. efforts against the mysterious condition. The announcement, Monday, July 31, 2023 comes amid frustration from patients who've struggled for months or years with sometimes disabling health problems. (NIAID-RML via AP, File)
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