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Antigenic evolution of H9N2 chicken influenza viruses isolated in China during 2009–2013 and selection of a candidate vaccine strain with broad cross-reactivity

VaccinationViral EvolutionCandidate Vaccine StrainVaccine DevelopmentMedicineImmunologyVirologyStrain SelectionInfluenza VaccineAntigenic EvolutionBroad Cross-reactivityInfluenza Vaccines