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Partial protection induced by Salmonella based Brucella vaccine candidate in pregnant guinea pigs
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Partial protection induced by Salmonella based Brucella vaccine candidate in pregnant guinea pigs
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Partial protection induced by Salmonella based Brucella vaccine candidate in pregnant guinea pigs
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Journal Article
Partial protection induced by Salmonella based Brucella vaccine candidate in pregnant guinea pigs
2019
Overview
Residual virulence is a major drawback in current Brucella vaccines. Live vaccines induce abortions in pregnant animals. Hence, a novel anti-Brucella vaccine was developed utilizing rough Salmonella delivering four Brucella antigens. Safety implications during pregnancy, humoral immune responses, and protective efficacy against wild type Brucella was investigated in guinea pig model. The vaccine did not induce abortions or severe complications in pregnant guinea pigs when administered 4 × 108 CFU via intraperitoneal route. Systemic IgG determination against antigen components reveals induction of immunity via the Salmonella delivery. Protection efficacy against abortions was 33.3% (2/6) when midterm sow challenged with virulent Brucella 544 strain while none was protected in control group. Lower Brucella recovery in spleen and liver and reduced histopathological burden were also noticed. Although abortion induced by Brucella challenge was not completely prevented, the vaccine candidate may perform better with optimization of vaccination such as inoculation dose optimization.
