“Most patients who suffer from long COVID were previously healthy and are extremely frustrated and exasperated by this condition,” says Irina Petrache, professor of medicine and chief of the division of pulmonary, critical care, and sleep medicine at National Jewish Health [and professor of medicine at CU School of Medicine]. “Lots of folks are expecting answers more quickly than the speed with which we can provide them because of how new this is and how unexpected this new syndrome has been.”