agar and Paratyphoid-Fever

The Vi capsular polysaccharide (Vi) is both a virulence factor and a protective antigen of Salmonella typhi; its pathogenic role for Salmonella paratyphi C is less well understood. We found no differences between the antigenic and immunogenic properties and the structure of the Vi from representative strains of S. paratyphi C, S. typhi, and Citrobacter freundii. There were, however, differences in both the amount produced per cell and the degree of association with the cell among the Vi from the three species of Enterobacteriaceae. S. paratyphi C produced less Vi than both the wild-type S. typhi and C. freundii did, and it showed the fastest release of Vi into the media. These findings may provide an explanation for the inability of the Vi to inhibit completely the agglutination of S. paratyphi C by anti-O sera. In an outbreak of enteric fever caused by S. paratyphi C, 66 of 78 isolates (85%) were Vi positive.

Topics: Adolescent; Adult; Agar; Animals; Antibodies, Bacterial; Antigens, Bacterial; Child; Child, Preschool; Citrobacter; Humans; Immune Sera; Immunodiffusion; Infant; Magnetic Resonance Spectroscopy; Molecular Structure; Paratyphoid Fever; Polysaccharides, Bacterial; Rabbits; Salmonella; Salmonella paratyphi C; Salmonella typhi

Topics: Agar; Animals; Bacteriological Techniques; Bile; Blood; Cattle; Culture Media; Glycine max; Humans; Methods; Paratyphoid Fever; Salmonella paratyphi A; Salmonella typhi; Typhoid Fever

Topics: Agar; Animals; Bacteriology; Bile; Bromthymol Blue; Characidae; Citric Acid; Culture Media; Enteritis; Humans; Lactose; Paratyphoid Fever; Potassium; Salmonella; Salmonella typhi; Typhoid Fever; Typhoid-Paratyphoid Vaccines

Topics: Agar; Bacillus; Bile; Citrates; Citric Acid; Culture Media; Lacticaseibacillus casei; Paratyphoid Fever; Salmonella; Salmonella typhi; Typhoid Fever; Typhoid-Paratyphoid Vaccines

Topics: Agar; Bismuth; Culture Media; Paratyphoid Fever; Salmonella; Sulfites; Typhoid Fever; Typhoid-Paratyphoid Vaccines