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Title:   Author  item
                                            Edrington, Thomasitem
                                            Bischoff, Kennethitem
                                            Looper, Michaelitem
                                            Callaway, Todditem
                                            Genovese, Kenneth

                                                         - *Ken*item
                                            Jung, Yong Sooitem
                                            Anderson, Robinitem
                                            Nisbet, David
  Submitted to: American Society of Animal Science
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/23/2003
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Mature dairy cattle were sampled over a two-year period (2001 - 2002) on five farms in New Mexico and Texas.  Fecal samples were collected via rectal palpation, cultured for Salmonella, and one isolate from each positive sample serotyped.  Three isolates of each serotype, with the exception of Salmonella Newport (n = 10), were examined for antimicrobial susceptibility using the broth micro-dilution technique.  Twenty-two different serotypes were identified from a total of 393 Salmonella isolates.  Montevideo was the predominant serotype (27%) followed by Mbandaka (15%), Senftenberg (11.4%), Newport (6.4%), Anatum (4.8%) and Give (4.8%).  Salmonella Typhimurium and Dublin, two frequently reported serotypes, accounted for only 1% of the observed serotypes in this study.   Sixty-four percent of the serotypes were susceptible to all of the antimicrobials, 14% were resistant to a single antibiotic, and 22% were multi-resistant (2 to 11 types of resistance).  All isolates tested were susceptible to amikacin, apramycin, imipenem, ceftriaxone, nalidixic acid, and ciprofloxacin.  The most frequent types of resistance were to sulfamethoxazole, tetracycline, streptomycin, kanamycin, chloramphenicol, and ampicillin (ranging from 8.9 to 22.4%).  Serotypes demonstrating multiple resistance included Dublin and Give (resistant to 3 or more antibiotics), Typhimurium (resistant to 5 antibiotics) and Newport (4 and 2 isolates resistant to 6 and 9 antibiotics, respectively).  Class 1 integrons were present in only three isolates, two S. Dublin and one S. Newport.  The most prevalent resistance patterns observed in this study were for antimicrobial agents commonly used in cattle, while all Salmonella isolates were susceptible to ceftriaxone and ciprofloxacin, antibiotics used in human medicine.


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