"""However, with analogy to influenza, it was shown many years ago that the simple insertion of a polybasic site into an H3 virus does not result in a high path

"""However, with analogy to influenza, it was shown many years ago that the simple insertion of a polybasic site into an H3 virus does not result in a high pathogenicity phenotype7 and is likely to only function in the context of a series of other genomic changes provided by a process of natural selection.""" https://www.thelancet.com/journals/lanmic/article/PIIS2666-5247(21)00174-9/fulltext https://www.thelancet.com/journals/lanmic/article/PIIS2666-5...