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Madison – The H5N1 bird flu virus, which has infected cow herds in the USA since March but has spared humans with a few exceptions, could not be transmitted to other animals via the respiratory tract in ferrets, a model for human flu, in a recent study in Nature (2024; DOI: 10.1038/s41586-024-07766-6). In laboratory tests, however, the viruses bound to the receptors through which human flu viruses enter the…