So-called "covid toes" may in fact be unrelated to the coronavirus. Experts from Yale University in Connecticut (USA) have come to this conclusion, journal PNAS writes. The scientists studied data on 23 people with suspected coronavirus infection and also with complaints of "covid toes". However, the disease was confirmed in only 3 patients. Experts believe that the real cause of problems with the toes was the fact that many people during the pandemic stayed in their homes and did not wear socks and shoes. Previously, scientists suggested that purple toes and symptoms of "pseudo-frostbite" appear because of the active fight of the immune system against the virus. They supported this theory with arguments that COVID-19 was undetectable in most patients with such symptoms, but appeared after treatment. The authors of the new study emphasized that they could not completely rule out an immune response to SARS-CoV-2, but they considered it most likely that the origin of "covid toes" had some indirect causes.