> for the virus to infect humans efficiently, it must adapt to bind alpha-2,6-linked sialic acids, which are predominant in the human respiratory tract. > covid 19 spike protein interaction: the spike (s) protein of sars-cov-2 may interact with sialic acids on host cells, potentially enhancing viral attachment and facilitating access to ace2. the vax was a precursor to prime the receptors for bird flu
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