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- William L Ince, Fraser B Smith, Julian J O'Rear, and Michael Thomson.
- Division of Antivirals, US Food and Drug Administration, Silver Spring, Maryland, USA.
- J. Infect. Dis. 2020 Aug 17; 222 (6): 957-961.
AbstractInfluenza viruses harboring treatment-emergent I38F/M/N/T substitutions in the polymerase acidic (PA) endonuclease exhibited reduced susceptibility to baloxavir and were associated with virus rebound and variable clinical response in clinical trials. US regulatory review of registrational trial data also identified treatment-emergent PA substitutions E23K in A/H1N1 viruses and E23G/K, A37T, and E199G in A/H3N2 viruses, which conferred reduced susceptibility to baloxavir, although to a lesser degree than I38F/M/N/T substitutions, and were associated with virus rebound. Although these non-I38 substitutions emerged less frequently than substitutions at I38, they represent alternate pathways to baloxavir virologic resistance and should be monitored accordingly.Published by Oxford University Press for the Infectious Diseases Society of America 2020.
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