Increased kynurenine-to-tryptophan ratio in the serum of patients infected with SARS-CoV2: An observational cohort study.

Luana Lionetto, Martina Ulivieri, Matilde Capi, Donatella De Bernardini, Francesco Fazio, Andrea Petrucca, Leda Marina Pomes, Ottavia De Luca, Giovanna Gentile, Barbara Casolla, Martina Curto, Gerardo Salerno, Serena Schillizzi, Maria Simona Torre, Iolanda Santino, Monica Rocco, Paolo Marchetti, Antonio Aceti, Alberto Rícci, Rita Bonfini, Ferdinando Nicoletti, Maurizio Simmaco, Marina Borro