RIO DE JANEIRO, July 7 (Xinhua) -- To Brazil, the "Land of the Future" has meant more than a tribute by Austrian writer Stefan Zweig who took refuge in the South American country from war in the 1940s ...

本文聚焦2024-2025年美国爆发的2.3.4.4b分支HPAI H5N1新型基因型B3.13和D1.1，首次揭示其通过野鸟迁徙传入并跨物种感染奶牛，引发乳腺炎和产奶量骤降。研究通过基因组溯源发现两类基因型均为"4+4"重配株（B3.13保留欧亚谱系A1的PA/HA/NA/M基因，D1.1保留A3的PB1/HA/M/NS基因），证实PB2 ...