title: Associations between vaccinations against protozoal and viral infections and Salmonella in broiler flocks.
abstract: Reducing the burden of Salmonella in broiler flocks presents a challenge for public health. Worldwide, grow-out broilers are routinely vaccinated to prevent or lessen clinical manifestation of other infections. In this exploratory analysis we tested if details of a routine vaccination programme delivered to conventional grow-out broilers were associated with the burden of Salmonella in the flock as it progressed through its production cycle. None of the flocks studied were vaccinated against Salmonella or received a competitive exclusion product. The flocks were reared on conventional grow-out farms in southeastern USA, and sampled in a prospective field observational study. We observed significant associations between the content and design of a grow-out vaccination programme targeting other infections and the probability of detecting Salmonella in the broiler flock at different time points throughout the production cycle. To the best of the authors' knowledge, this is the first field report of such associations.
authors.affiliation: Epidemiology Group, Centre for Infectious Diseases, University of Edinburgh, Edinburgh, UK. Victoriya.Volkova@ed.ac.uk
authors.forename: V V
authors.initials: VV
authors.lastname: Volkova
authors.forename: R W
authors.initials: RW
authors.lastname: Wills
authors.forename: S A
authors.initials: SA
authors.lastname: Hubbard
authors.forename: D
authors.initials: D
authors.lastname: Magee
authors.forename: J A
authors.initials: JA
authors.lastname: Byrd
authors.forename: R H
authors.initials: RH
authors.lastname: Bailey
mesh_terms: D000818:Animals; D002645:Chickens; D011201:Poultry Diseases / Q000209:etiology / Q000382:microbiology / Q000517:prevention & control*; D011529:Protozoan Infections, Animal / Q000150:complications / Q000517:prevention & control; D016052:Protozoan Vaccines / Q000008:administration & dosage / Q000276:immunology*; D012481:Salmonella Infections, Animal / Q000209:etiology* / Q000382:microbiology; D014765:Viral Vaccines / Q000008:administration & dosage / Q000276:immunology*; D014777:Virus Diseases / Q000150:complications / Q000517:prevention & control
chemical_list: D016052:Protozoan Vaccines; D014765:Viral Vaccines