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Title:   Author  item
                                            Edrington, Thomasitem
                                            Callaway, Todditem
                                            FARROW, RUSSELL - Texas A&M Universityitem
                                            Anderson, Robinitem
                                            Nisbet, David
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/22/2010
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Previous research conducted by our laboratory investigated the incidence of multi-drug resistant (MDR) Salmonella in dairy cattle and reported that individual cattle, and most often calves, can shed multiple Salmonella serotypes that vary in the degree of antibiotic resistance.  More recently, we discovered a high incidence of a MDR generic E. coli (MDR GEC) in dairy calves.  Taken together, this suggests the generic E. coli population may be an important reservoir for resistance elements that could potentially spread to Salmonella.  Therefore, the objective of the current research was to determine if resistance transfers from MDR GEC in naturally-colonized calves to inoculated strains of pan-susceptible Salmonella (Experiment I) and to examine the role of protozoa on resistance transfer (Experiment II).  Both experiments utilized Holstein calves (approx. 3 weeks old) naturally-colonized with MDR GEC and fecal culture negative for Salmonella.  Fecal samples were collected for culture of Salmonella and MDR GEC throughout both experiments following experimental inoculation with the pan-susceptible Salmonella strains.  Results from Experiment I suggests that resistance did transfer from the MDR GEC to the inoculated strains of Salmonella, with these stains demonstrating multiple antibiotic resistance following in vivo exposure to MDR GEC.  In the second experiment, all fecal samples in all treatments were Salmonella negative, indicating that resistance transfer did not occur from MDR GEC to the inoculated Salmonella under these experimental conditions.  Based on the results, it appears that antimicrobial resistance can transfer from MDR GEC to Salmonella, but the role of protozoa could not be determined.


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