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Oral co-administration of live attenuated Salmonella enterica serovar Typhimurium expressing chicken interferon-α and interleukin-18 enhances the alleviation of clinical signs caused by respiratory infection with avian influenza virus H9N2

VaccinationOral Co-administrationMicrobial PathogensViral ImmunityImmunologyClinical SignsRespiratory InfectionInfectious Respiratory DiseaseInfluenza VaccineInfection ControlSerovar TyphimuriumMedicineClinical Microbiology