Zanamivir-resistant influenza viruses with Q136K or Q136R neuraminidase residue mutations can arise during MDCK cell culture creating challenges for antiviral susceptibility monitoring Little, Karen and Leang, Sook-Kwan and Butler, Jeff and Baas, Chantal and Harrower, Bruce and Mosse, Jenny and Barr, Ian G and Hurt, Aeron C, Eurosurveillance, 20, 30060 (2015), https://doi.org/10.2807/1560-7917.ES.2015.20.45.30060