A screenshot of an NHK WORLD-JAPAN News article titled "Researchers link Long COVID to another virus." The accompanying image shows a woman with dark, shoulder-length hair wearing a black blouse and a patterned scarf, gesturing toward a laptop screen displaying a diagram. The text snippet below explains that researchers in Japan have found that COVID-19 aftereffects, including fatigue, occur when a coronavirus infection activates another dormant virus already inside the body.