Evaluating the fitness of PA/I38T-substituted influenza A viruses with reduced baloxavir susceptibility in a competitive mixtures ferret model. oleh Leo Y Lee, Jie Zhou, Paulina Koszalka, Rebecca Frise, Rubaiyea Farrukee, Keiko Baba, Shahjahan Miah, Takao Shishido, Monica Galiano, Takashi Hashimoto, Shinya Omoto, Takeki Uehara, Edin J Mifsud, Neil Collinson, Klaus Kuhlbusch, Barry Clinch, Steffen Wildum, Wendy S Barclay, Aeron C Hurt