4W8N:
reference: Assessment of transmission, pathogenesis and adaptation of H2 subtype influenza viruses in ferrets., Pappas C, Yang H, Carney PJ, Pearce MB, Katz JM, Stevens J, Tumpey TM, Virology. 2015 Feb 4;477C:61-71. doi: 10.1016/j.virol.2015.01.002. PMID: 25659818

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