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Hemagglutinin (HA) is a surface glycoprotein found in influenza viruses. This particle plays two crucial functions in the viral life cycle: it allows for the attachment of the virus into the host cell and participates in the fusion of the virus and host membranes. There are 18 different subtypes of HA. Recently, the H17 and H18 strains have been discovered whose hosts were bats. The evolution of these two strains had most likely occurred in isolation for a long period of time. This work presents the phylogenetic analysis and study on mutational variability based on sequences from all 18 currently known HA strains belonging to influenza virus type A. The results have been presented regarding the current knowledge about influenza. The classical software (Clustal, PHYLIP, and ConSurf) as well as original applications (SSSSg and Consensus Constructor) have been used in this research.

Phylogenetic and variability study on all known hemagglutinin subtypes of influenza A virus