A study led by David Putrino at Mount Sinai identified specific blood biomarkers in Long COVID patients, including 50% lower levels of cortisol and signs of T-cell exhaustion. The research also found the reactivation of dormant viruses like Epstein-Barr and herpes in those suffering from the condition. The study aims to provide a clinical basis for a condition that has largely been diagnosed through subjective symptoms like brain fog and fatigue.
