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Prevalence of the N-X-T/K motif in Guangdong, China from 2012 to 2019. The sequences of 106 clinical strains in Guangdong, China from 2012 to 2019 were collected from GISAID. The substitutes N-X-T/K at position 158–160 were analyzed. The y-axis on the left: the number of the substitutes N-X-T and N-X-K at HA1 residues 158–160; The y-axis on the right: the percentage of the substitutes N-X-T and N-X-K at HA1 residues 158–160.
