Vi antigen from Salmonella typhosa and immunity against typhoid fever. 11. Safety and antigenicity in humans.
نویسندگان
چکیده
Safety and antigenicity of a purified preparation of Salmonella typhosa Vi antigen was evaluated in human volunteers. Dosages of Vi antigen at 25, 50, and 100 mug were less toxic than U.S. standard typhoid vaccine (lot 6A) containing 5 X 10(8) bacteria per dosage. Vi antigen in comparison with the standard typhoid vaccine induced higher hemagglutinating antibody but lower bactericidal antibody responses.
منابع مشابه
Vi antigen from Salmonella typhosa and immunity against typhoid fever. I. Isolation and immunologic properties in animals.
The role of Vi antigen in human immunity against typhoid fever has been debated for decades. Circumstantial evidence indicates that Vi antigen may play a role in pathogenicity and immunity. A Vi preparation was isolated from Salmonella typhosa, the causative organism in human typhoid fever, by a mild precipitation method. It was significantly more potent in animal studies than preparations from...
متن کاملVi-negative strains of Salmonella typhosa: attempts to induce W-V reversion and the use of non-Vi strains in evaluating typhoid vaccines.
Tully, Joseph G. (Walter Reed Army Institute of Research, Washington, D.C.) and Julius A. Currie. Vi-negative strains of Salmonella typhosa: attempts to induce W-V reversion and the use of non-Vi strains in evaluating typhoid vaccines. J. Bacteriol. 84:747-753. 1962.-Repeated attempts have been made to detect reversion of several W-form Salmonella typhosa strains to Vi antigen-containing cultur...
متن کاملAssay of typhoid vaccines with Salmonella typhosa-Salmonella typhimurium hybrids.
Salmonella typhimurium hybrids expressing the S. typhosa antigens 9, d, and Vi were constructed by genetic crosses with an S. typhosa Hfr donor. The hybrids retained the same degree of mouse virulence as their S. typhimurium parent strain, the minimum lethal dose being less than 50 organisms when tested either in C(57) black mice or Swiss white mice. Vaccination of the Swiss white mice with S. ...
متن کاملRole of typhoid antigens in protection and pathogenicity for mice.
Swiss white mice immunized with acetone-killed vaccines prepared from strains of Salmonella typhosa, S. typhimurium, and mouse-virulent S. typhimurium hybrids which had acquired, by conjugal genetic transfer, the S. typhosa antigens 9, Vi, and d were challenged with the S. typhimurium hybrids and with the S. typhimurium parent strain. The results of these experiments suggested that the Salmonel...
متن کاملMOLECULAR CHARACTERIZATION AND OPTIMIZATION OF VI-CAPSULAR POLYSACCHARIDE OF SALMONELLA TYPHI TY6S PRODUCTION IN BIOREACTOR
The role of Vi-capsular polysaccharide (Vi-CPS) in human immunity against infection caused by Salmonella typhi is well known. The downstream process of purification generally causes depolymerization of Vi-CPS to a nonimmunogenic low molecular weight form. In the present study, a standard strain of Sal. typhi Ty6s was grown under submerge cultural conditions in a pilot-plant scale of 90 Liter fe...
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ورودعنوان ژورنال:
- Infection and immunity
دوره 12 6 شماره
صفحات -
تاریخ انتشار 1975