Antimicrobial resistance and R-plasmid in Salmonella spp from swine and abattoir environments

Abstract

Salmonella serovars isolated from swine are of particular interest not only because of the pathogenic potential for this animal species, but also due to its relevance with regard to public health. On basis of the profile of resistance to antimicrobials, 13 Salmonella strains were selected which belonged to the serovars Muenster (7), Derby (4), Typhimurium (1), and Braenderup (1). They were isolated from healthy swine as well as from the abattoir environment in the state of Rio de Janeiro. All strains of Salmonella were subjected to bacterial conjugation, and the E. coli K12 Nal r Lac+ F standard strain was used as receptor, with the purpose to verify the ability to transfer the resistance marks. Gene transfer phenomenon was detected in seven strains, and except SalmonellaTyphimurium which transconjugated to Sm, Tc and Su, the remaining ones were characterized by transferring mark Su only. By plasmidial analysis of strains used and their respective transconjugants, 63 Kb plasmid was found, which was probably related to S. Typhimurium resistance.

Characterization of Antibiotic Resistant <i>Salmonella spp</i> Isolated from Chicken Eggs of Dhaka City

“…The level of resistance of Salmonellae to antibiotics should be alarming to the food processing, distribution and handling of food product [18,19]. Therefore, it is necessary to inform people involved in the food industry as well as distributors to take care in handling the food products.…”

Characterization of Salmonella enterica Serovar Agona Slaughter Isolates from the Animal Arm of the National Antimicrobial Resistance Monitoring System—Enteric Bacteria (NARMS): 1997 through 2003

“…However, in some Salmonella serovars integrons have also been found on the chromosome (7,11,14,15,17,30). Class 1 integrons have been targeted as potential sources for resistant gene clusters located on both a plasmid and chromosomally (5)(6)(7)(8)10,11,14,15,19,29,39).…”

“…Recent studies examining DT104 have concluded that its multiple drug resistance may be transferable to other enteric pathogens (14). S. Agona is one serotype that has been recognized to have a gene cassette coding for multiple drug resistance similar to DT104 (7,11,15,30). More research is needed on MDR Salmonella and particular serovars, such as S. Agona, that…”

Multidrug resistant <i>Salmonellae</i> isolated from blood culture samples of suspected typoid patients in Warri, Nigeria

“…(Table 3). This is a major clinical challenge since the ease with which resistance markers are transferred, increases with the resistance being plasmid-borne (23). Of particular interest is isolate CS-017 (Table 3) that equally lost its resistance to the fluoroquinolones(FQs) Na and Cpx after acridine orange treatment.…”

“…This is a case of an emerging Plasmid Mediated Quinolone Resistance (PMQR). Further research into this isolate is ongoing, to establish whether its FQ resistance is due to a qnr, aac(6 ' )Ib-cr or qep protein which has been established to confer PMQR to certain Enterobacteriaceae (23). With the rising incidence of typhoid fever infection in our locality, the scenario cannot be any worse, if treatment failure are increasingly encountered.…”