Prevalence and genomic characterization of Salmonella Weltevreden in commercial pig feed.

Viet Nam is the world's fifth largest producer of pork meat. Salmonella is frequently found at farm level; however, risk factors for Salmonella infection in pigs have not been thoroughly investigated in the production system. In the current study, 123 commercial feed samples were obtained from 103 small, medium and large-scale pig farms in Viet Nam and investigated for the presence of Salmonella in 25 g of feed using the ISO 6579:2002/Cor 1:2004 method.

The Small Protein CydX Is Required for Cytochrome Quinol Oxidase Stability and Function in Salmonella enterica Serovar Typhimurium: a Phenotypic Study.

Cytochrome quinol oxidases, which have a greater affinity for oxygen than heme-copper cytochrome oxidases (HCOs), promote bacterial respiration and fitness in low-oxygen environments, such as host tissues. Here, we show that, in addition to the CydA and CydB subunits, the small protein CydX is required for the assembly and function of the cytochrome complex in the enteric pathogen serovar Typhimurium. Mutant Typhimurium lacking CydX showed a loss of proper heme arrangement and impaired oxidase activity comparable to that of a Δ mutant lacking all cytochrome subunits.