Journal of Pure and Applied MicrobiologyVol. 8 No. 2

Evaluation of Protective Efficacy of Salmonella flagellin as Vaccine Antigen

Mithilesh Singh1, Tapas Kumar Goswami1 and Kuleep Dhama2

1Immunology Section, I.V.R.I, Izatnagar - 243 122, India. 2Avian Disease Section, I.V.R.I, Izatnagar - 243 122, India.

Received on 11 October 2013 and accepted on 29 November 2013

 

ABSTRACT

Salmonellosis is a disease complex of man and animals caused by various serovars of Salmonella enterica subspecies enterica. Salmonella spp. are facultative intracellular pathogens capable of causing localized and systemic disease of significant morbidity and mortality. The present study was aimed to investigate the immune response elicited in mice following subcutaneous immunization with purified flagellin derived from Salmonella enterica serovar Typhimurium. Humoral immune response in mice was analyzed by indirect enzyme linked immunosorbent immunoassay (ELISA) wherein a significantly greater antibody response was noticed in immunized group of mice compared to the control group. Further confirmation by western blotting showed immunoreactivity of the isolated flagellin against sera obtained from flagellin immunized group on 21st day post immunization. Bacterial colony count in spleen from the mice immunized with flagellin and challenged with Salmonella intra-peritoneally showed complete clearance of the bacteria. In conclusion, bacterial flagellin demonstrated the seroconversion and protective efficacy against homologous bacterial challenge post immunization. Further explorative studies are suggested to unravel its potential application to be used as vaccine antigen or adjuvant.

Keywords : Salmonella, Flagellin, Mice, Vaccine, Adjuvant.