 PERTH, Australia--BUSINESS WIRE--A clinical research collaboration on COVID-19 pheno-conversion and subsequent pheno-reversion has discovered transient and persistent systemic changes of the molecular signatures in patient blood samples three months after the acute COVID-19 disease phase. These biochemical abnormalities, identified by a quantitative, label-free assay platform integrating nuclear magnetic resonance NMR spectroscopy and mass spectrometry MS, relate to ongoing long COVID s 