C. Cazaban1, W.B.F. Swart2, R.M.W. Rietema3, J.J. de Wit4, Y. Gardin1
1: Ceva Animal Health, Libourne, France; 2: Ceva Animal Health Benelux, Naaldwijk, the Netherlands; 3: Pluimveepraktijk Noord & Oost, Slagharen, the Netherlands; 4: Animal Health Service (GD), Deventer, the Netherlands
Infectious bursal disease (IBD) is a major virus disease in chickens worldwide. It is due to infectious bursal disease virus (IBDV), a birnavirus. Only one serotype is pathogenic in chickens (serotype 1), however several antigenic types and pathotypes are circulating in various parts of the world (Eterradossi & Saif 2013). Prevention is mainly done by vaccination. A global trend of the poultry industry is to move towards hatchery vaccination for convenience reasons. Immune-complex IBD vaccine is addressing the needs for hatchery vaccination, consistent immunization, and progressive displacement of field IBD virus by the attenuated vaccinal IBDV strain (Kelemen et al., 2000). Concerns have been raised about the performance of such vaccine type in chicks (or embryos) in “low” maternal immunity flocks at hatch. Field scale trials were implemented in a commercial operation in the Netherlands in three rounds of broilers. Indeed, country-wise routine breeder vaccination does not include any killed IBD vaccine, and the subsequent passive immunity is minimal.