Characterization of the plasmidic or chromosomal cpe gene and metabolic activities in Clostridium perfringens isolates from food in San Luis--Argentina.

Food poisoning and non-food poisoning illnesses due to C. perfringens (by enterotoxin production) have been associated to chromosomal or plasmidic location of the cpe gene, respectively. Clostridial pathogenicity has been correlated to protease and azoreductase production.

Pulsed field, PCR ribotyping and multiplex PCR analysis of Yersinia enterocolitica strains isolated from meat food in San Luis Argentina.

The characterization of phenotypic and genotypic virulence markers of Yersinia enterocolitica strains belonging to biotypes (B) 1A, 2 and 3, mostly isolated from food in San Luis, Argentina, and the assessment of their genotypic diversity using PFGE and PCR ribotyping, were performed in our laboratory for the first time. Thirty five Y. enterocolitica strains, two reference strains and 33 strains isolated in our laboratory were studied.

Prevalence and characterization of Clostridium perfringens from spices in Argentina.

Spices can present high microbial counts and Clostridium perfringens, Bacillus cereus, Salmonella and Shigella, among others have been isolated from spices. C. perfringens is an important pathogen agent causing, among other diseases, enteritis in humans caused by C.

Immunogenic protein variations of Clostridium chauvoei cellular antigens associated with the culture growth phase.

The immunoprotective capacity of four Clostridium chauvoei strains at different growth stages is reported. In all the strains tested, the cells coming from the stationary phase were those with the highest immunoprotective capacity and, depending on the strain, this protective capacity diminished or even disappeared in other phases. Protein profiles were similar in all the strains and few proteins were differentially expressed during growth as shown by SDS-PAGE.