Hydropathic evolution of hemagglutinin and neuraminidase glycoproteins of A(H1N1 and H3N2) viruses

More virulent strains of influenza virus subtypes H1N1 appeared in 2007 and H3N2 in 2011. The amino acid differences from prior less virulent strains appear to be small when tabulated through sequence alignments and counting site identities and similarities. Here we show how analyzing fractal hydropathic forces responsible for globular compaction and modularity quantifies the mutational origins of increased virulence, and also analyzes receptor sites and N-linked glycan accretion.