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Genotyping of V/K/E at PB2 residue 627 among chickens inoculated or infected with human HK3263 H7N9. Two-step genotyping assays were performed to determine the proportion of V/K/E at PB2 residue 627 from the inoculum of HK3263 or the oropharyngeal swabs of chickens in two separate replicates of the transmission experiment (A and B).
