Toyos, J. (J.)
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- Immunological identity of brucella native hapten, polysaccharide B, and yersinia enterocolitica serotype 9 native hapten(American Society for Microbiology, 1982) Moriyon, I. (Ignacio); Toyos, J. (J.); Fernandez-Lago, L. (Luis)Yersinia enterocolitica serotype 9 contained an antigenic component giving a reaction of total identity with Brucella native hapten and polysaccharide B. This component was present in a phenol-water extract (fraction 5; M. Redfearn, Ph.D. Thesis, University of Wisconsin, Madison, 1960) along with the smooth lipopolysaccharide. The native hapten could be purified free of lipopolysaccharide and proteins by gel filtration.
- Analysis by coagglutination of the distribution of a 24,000-dalton surface protein in Yersinia isolates(American Society for Microbiology, 1986) Moriyon, I. (Ignacio); Diaz, R. (Ramón); Urra, E. (E.); Toyos, J. (J.)The presence of a 24,000-dalton surface protein in 215 isolates of Yersinia enterocolitica and related species was examined. By coagglutination with the specific antiserum, a 100% correlation with the pathogenic biogroups was found. Thus, this method is useful for the rapid screening of potential pathogenic Y. enterocolitica isolates.
- Characterization of a Yersinia enterocolitica antigen common to enterocolitis-associated serotypes(American Society for Microbiology, 1985) Moriyon, I. (Ignacio); Diaz, R. (Ramón); Urra, E. (E.); Toyos, J. (J.)Yersinia enterocolitica synthesized an exocellular antigen common to the serotypes associated with enterocolitis but absent from other serotypes or from other Yersinia species. Both virulent Ca2+-dependent and avirulent Ca2+-independent isogenic pairs derived from the enterocolitis-associated serotypes synthesized the common antigen. Requirements for the synthesis of this common antigen were (i) the presence of metabolizable sugars and (ii) growth on a solid medium at 37 degrees C. The antigen was identified as a 24,000-dalton protein loosely associated with the cell surface but absent from either the cell envelope or the cytoplasmic fraction.