A study of the lungs of 41 people who died from COVID-19 in Italy has revealed extensive damage, persistent distortion of the normal organ structure, scarring of respiratory tissue, and massive blood clotting of the arteries and veins, which may help explain why it takes some people—so-called "long haulers"—months to recover from fatigue and shortness of breath. The results were published yesterday in The Lancet's EBioMedicine journal. While the researchers also examined brain, heart, and kidney tissues, those organs showed no signs of damage or viral replication.