The tryptophan catabolite or kynurenine pathway in COVID-19 and critical COVID-19: a systematic review and meta-analysis.
Abbas F AlmullaThitiporn SupasitthumrongChavit TunvirachaisakulAli Abbas Abo AlgonHussein K Al-HakeimMichael MaesPublished in: BMC infectious diseases (2022)
Our results indicate increased activity of the IDO enzyme in COVID-19 and severe/critical patients. The TRYCAT pathway is implicated in the pathophysiology and progression of COVID-19 and may signal a worsening outcome of the disease.