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Opportunities and challenges for successful translation of star PEG-based drug formulations into clinical use were also discussed. V.Baloxavir marboxil (BXM) is a potent inhibitor of the polymerase acidic (PA) protein of influenza viruses. However, clinical trials predominantly involving influenza A(H1N1) and A(H3N2) infections showed that BXM exhibited a low barrier of resistance. Contrasting with influenza A viruses, BXM-resistant influenza B variants remain poorly documented. We evaluated the impact of I38 T/M and E23K PA substitutions, previously report