title: The use of gamma irradiation for the inactivation of infectious bursal disease viruses.
abstract: The maximum dosage of gamma irradiation approved by the U.S. Food and Drug Administration (FDA) for poultry is 3.0 kiloGrays (kGy). This treatment is designed to reduce bacterial contamination on uncooked poultry carcasses and meat products. The possible presence of infectious bursal disease virus (IBDV) on poultry postharvest has prompted some countries to study the risk associated with introducing nonnative strains of the virus from imported commodities. The goal of this study was to determine if this risk could be reduced using gamma irradiation to inactivate IBDV. At the dosage approved by the FDA, the titers of IBDV vaccine strains were reduced between 0 and 1 log10. Titers of the pathogenic IBDV strains tested were not reduced after the 3.0 kGy exposure. Furthermore, titers of pathogenic viral strains were not reduced following exposure up to 5.0 kGy. As the exposure to gamma irradiation increased, the titers of the vaccine strains decreased. At the maximum dosage tested (10 kGy), the 89/03 variant virus vaccine was completely inactivated. Titers of the three classic IBDV vaccine strains were reduced between 1.6-2.0 logs after the 10 kGy exposure; however, these viruses remained viable after this treatment. Gamma irradiation is not an effective intervention to reduce the risk of IBDV introduction via processed poultry.
authors.affiliation: Food Animal Health Research Program, The Ohio Agricultural Research and Development Center, The Ohio State University, 1680 Madison Avenue, Wooster, OH 44691, USA. jackwood.2@osu.edu
authors.forename: D J
authors.initials: DJ
authors.lastname: Jackwood
authors.forename: S E
authors.initials: SE
authors.lastname: Sommer-Wagner
authors.forename: H J
authors.initials: HJ
authors.lastname: Pharo
mesh_terms: D000818:Animals; D018175:Birnaviridae Infections / Q000473:pathology / Q000662:veterinary* / Q000821:virology; D002060:Bursa of Fabricius / Q000473:pathology / Q000821:virology; D002645:Chickens / Q000821:virology*; D004307:Dose-Response Relationship, Radiation; D005720:Gamma Rays; D007243:Infectious bursal disease virus / Q000528:radiation effects*; D011201:Poultry Diseases / Q000473:pathology / Q000821:virology*; D014765:Viral Vaccines; D038301:Virus Inactivation / Q000528:radiation effects*
chemical_list: D014765:Viral Vaccines