Researchers have discovered abnormalities in the lungs of long Covid patients who have breathlessness which cannot be detected with routine tests. The Explain study uses xenon, an odourless, colourless, tasteless and chemically non-reactive gas, to investigate possible lung damage in the patients who have not been admitted to hospital, but continue to experience the symptom. The initial results of the study suggest there is significantly impaired gas transfer from the lungs to the bloodstream in the long Covid patients despite other tests – including CT scans – coming back as normal. The study…