Letter to the editor: Highly pathogenic influenza A(H5N1) viruses in farmed mink outbreak contain a disrupted second sialic acid binding site in neuraminidase, similar to human influenza A viruses

致编辑的信：养殖水貂疫情中高致病性甲型流感病毒（H5N1）的神经氨酸酶第二个唾液酸结合位点遭到破坏，与人类甲型流感病毒类似。