https://xfoxfiles.com/2026/06/06/china-engineers-mutant-h5n1-influenza-viruses-560000-times-more-lethal-in-mammals-journal-emerging-microbes-infections/fox filesen2026-06-06T18:28:54+00:00China Engineers Mutant H5N1 Influenza Viruses 560,000 Times More Lethal in Mammals: Journal ‘Emerging Microbes & Infections’news, health, bird-flu, avian-influenza, h5n1