Comment on

• Enhanced virulence of influenza A viruses with the haemagglutinin of the 1918 pandemic virus.

  Kobasa D, Takada A, Shinya K, Hatta M, Halfmann P, Theriault S, Suzuki H, Nishimura H, Mitamura K, Sugaya N, Usui T, Murata T, Maeda Y, Watanabe S, Suresh M, Suzuki T, Suzuki Y, Feldmann H, Kawaoka Y. Kobasa D, et al. Nature. 2004 Oct 7;431(7009):703-7. doi: 10.1038/nature02951. Nature. 2004. PMID: 15470432