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• W3123727768 abstract "Non-typhoidal Salmonella (NTS) is a major cause of gastroenteritis and is responsible for approximately 93 million cases annually. In healthy individuals, gastroenteritis caused by NTS is usually self-limiting, however, NTS can cause severe invasive disease in immunocompromised patients. Very little research has been directed towards development of vaccines against Salmonella serogroups O:6,7 or O:8. We have constructed a live attenuated serogroup O:8 vaccine, CVD 1979, by deleting guaBA, htrA, and aroA from the genome of S. Newport. We have shown that the candidate vaccine is well tolerated in mice and elicits serum immunoglobulin G (IgG) antibodies against core O-polysaccharide (COPS) when administered orally. Immunized mice were challenged intraperitoneally with wild-type S. Newport and bacterial burden in the liver and spleen was found to be significantly reduced in the livers of immunized mice compared to control mice. We also observed moderate vaccine efficacy (45%) against lethal challenge with the serogroup O:8 serovar, S. Muenchen, but low vaccine efficacy (28%) following lethal challenge with a serogroup O:6,7 serovar, S. Virchow. In vitro, we have shown that antibodies generated by CVD 1979 only recognize lipopolysaccharide (LPS) from serogroup O:8 but not serogroup O:6,7 serovars, and that they mediate opsonophagocytic antibody (OPA) activity against serogroup O:8 but not serogroup O:6,7 serovars. We also showed that OPA activity can be blocked by pre-incubating the antisera with serogroup O:8 lipopolysaccharide. Taken together, our data demonstrate that we have constructed a well-tolerated, effective live attenuated S. Newport vaccine which elicits functional antibodies against serogroup O:8 but not O:6,7 serovars." @default.
• W3123727768 created "2021-02-01" @default.
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• W3123727768 date "2021-01-16" @default.
• W3123727768 modified "2023-10-08" @default.
• W3123727768 title "Refinement of a Live Attenuated Salmonella enterica Serovar Newport Vaccine with Improved Safety" @default.
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• W3123727768 doi "https://doi.org/10.3390/vaccines9010057" @default.
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