Exotoxins secreted by Clostridium septicum induce macrophage death: Implications for bacterial immune evasion mechanisms at infection sites.

The induction of macrophage death is considered a potential mechanism by which components secreted by Clostridium septicum are used to evade the innate immune response and cause tissue damage. This study aimed to determine the effects of partially purified fractions of extracellular proteins secreted by C. septicum on the death of mouse peritoneal macrophages.

Detection and Characterization of Shiga Toxin Producing Escherichia coli, Salmonella spp., and Yersinia Strains from Human, Animal, and Food Samples in San Luis, Argentina.

Shiga toxin producing Escherichia coli (STEC), Salmonella spp., and Yersinia species was investigated in humans, animals, and foods in San Luis, Argentina. A total of 453 samples were analyzed by culture and PCR.

Evaluation of a serum-free transport medium supplemented with cyanobacterial extract, for the optimal survival of Helicobacter pylori from biopsy samples and strains.

The purpose of this work was to evaluate the use of an alternative transport medium supplemented with a cyanobacterial extract (CE), free of animal derivatives, to preserve the viability of Helicobacter pylori strains during long-term transportation and allow its recovery from biopsy samples. The transport media evaluated were Mueller-Hinton broth 0.3% agar (MH) and 0.

Molecular characterization and susceptibility testing of Helicobacter pylori strains isolated in western Argentina.

Objective: To characterize Helicobacter pylori isolates from western Argentina using virulence markers and antimicrobial susceptibility patterns in order to assess the association between virulent genotypes, antimicrobial resistance, and disease. DNA fingerprinting was also evaluated for the segregation of virulent or resistant strain clusters.

Methods: Genotyping of 299 H.

Extracellular proteins of Clostridium chauvoei are protective in a mouse model.

The anaerobic bacillus Clostridium chauvoei is the causative agent of blackleg, a lethal disease that has an important impact on the sheep and cattle industry worldwide. Immunity to C. chauvoei is considered to be mainly anticellular, and for this reason there is scarce information about the immunogenicity of extracellular proteins.