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• W4290649209 abstract "Amino acid substitutions I38T and E23K in the influenza polymerase acidic (PA) protein lead to reduced susceptibility to the influenza antiviral drug baloxavir. The in vivo effectiveness of baloxavir and oseltamivir for treatment of these viruses is currently unknown. Using patient-derived influenza isolates, combination therapy was equally effective as monotherapy in reducing viral titers in the upper respiratory tract of ferrets infected with A(H1N1pdm09)-PA/E23K or A(H3N2)-PA/I38T. When treated with baloxavir plus oseltamivir, infection with a mixture of PA/I38T or PA/E23K and corresponding wild-type virus was characterized by a lower selection of viruses with reduced baloxavir susceptibility over the course of infection compared to baloxavir monotherapy. De novo emergence of the oseltamivir resistance mutation NA/H275Y occurred in ferrets treated with oseltamivir alone but not in ferrets treated with baloxavir plus oseltamivir. Our data suggest that combination therapy with influenza drugs with different mechanisms of action decreased the selection pressure for viruses with reduced drug susceptibility. IMPORTANCE Influenza viruses cause significant morbidity and mortality worldwide but can be treated with antiviral drugs. In 2018, a highly effective antiviral drug, baloxavir marboxil, was licensed. However, the selection of viruses with baloxavir resistance was relatively high following treatment, which may compromise the effectiveness of the drug. Here, we took two different influenza viruses that are resistant to baloxavir and tested the effectiveness alone and in combination with oseltamivir (a second influenza antiviral drug) in the ferret model. Our findings suggest that combination treatment may be a more effective method than monotherapy to reduce the selection of resistant viruses. These results may have important clinical implications for the treatment of influenza." @default.
• W4290649209 created "2022-08-08" @default.
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• W4290649209 date "2022-08-30" @default.
• W4290649209 modified "2023-10-14" @default.
• W4290649209 title "Effect of Baloxavir and Oseltamivir in Combination on Infection with Influenza Viruses with PA/I38T or PA/E23K Substitutions in the Ferret Model" @default.
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• W4290649209 doi "https://doi.org/10.1128/mbio.01056-22" @default.
• W4290649209 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35938724" @default.
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