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- W1754883868 abstract "A live oral vaccine consisting of attenuated Salmonella typhi Ty21a expressing Vibrio cholerae O1 Inaba lipopolysaccharide (LPS) O antigen was constructed and tested in volunteers for safety, immunogenicity, and efficacy. Fourteen adults ingested three doses of 10(10) viable organisms with buffer. One month later, 8 vaccinees and 13 unimmunized controls were challenged with 10(6) pathogenic V. cholerae O1 E1 T or Inaba organisms. No significant adverse reactions to vaccination were observed. All volunteers had significant rises in serum immunoglobulin G (IgG) antibody to S. typhi LPS. Only 2 (14%) of 14 had significant rises in serum IgA or IgG antibody to Inaba LPS, and 5 (36%) of 14 had fourfold rises in vibriocidal antibody. In the challenge study, diarrhea occurred in 13 of 13 controls and 6 of 8 vaccinees (vaccine efficacy, 25%; P = 0.13). The vaccine significantly reduced the severity of the clinical illness (P less than 0.05) and caused decreased excretion of challenge vibrios (P less than 0.05). Although the typhoid-cholera hybrid vaccine did not provide significant protection overall against experimental cholera, this study demonstrates the importance of antibody to V. cholerae O antigen in ameliorating clinical illness and illustrates the use of an S. typhi carrier vaccine strain expressing a foreign antigen." @default.
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- W1754883868 date "1990-06-01" @default.
- W1754883868 modified "2023-09-25" @default.
- W1754883868 title "Safety, immunogenicity, and efficacy against cholera challenge in humans of a typhoid-cholera hybrid vaccine derived from Salmonella typhi Ty21a" @default.
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- W1754883868 doi "https://doi.org/10.1128/iai.58.6.1620-1627.1990" @default.
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