Dynamics of salmonella morbidity of the primorsky region population against the background of the initial step of vaccination of poultry against salmonella at broiler breeder farm
The aim of the study was investigating the effect of vaccination against Salmonella using Nobilis Salenvac T vaccine for the parent stock to protect broiler chickens, on the Primorsky Region population’s Salmonella morbidity caused by certain plasmid types of Salmonella Enteritidis, and justifying the possibility of epidemiological assessment of chicken vaccination effectiveness in preventing human salmonellosis cases. Materials and methods. The plasmid characteristics of Salmonella Enteritidis isolated in 2012-2016 from 4720 patients and from 194 samples of alimentary products from broiler and egg farms of the Primorsky Region have been presented. Analysis of plasmid spectrum was performed using the method of Kado C.I. and Liu S.T., (1981). Results. Aconcept has been formulated regarding the effect of poultry vaccination against Salmonella at a specific broiler breeder farm on Salmonella morbidity of the Primorsky Region population. It was shown that a two-fold reduction of morbidity has been achieved for only two plasmid types 38 MDa and 38:1.4 MDa Salmonella Enteritidis circulating among birds of the broiler farm. Morbidity of population associated with the egg farm remained unchanged. Conclusions. Vaccination of chickens at a specific broiler breeder farm against Salmonella proved to be a highly effective preventive measure that helps to reduce population morbidity. Further reduction of Salmonella morbidity among the Primorsky Region population can be achieved by poultry vaccination at all poultry enterprises of the Region.