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Articles by N.A. Cox
Total Records ( 2 ) for N.A. Cox
  J.A. Cason , R.J. Buhr , L.J. Richardson and N.A. Cox
  External and internal persistence of inoculated Salmonella and spread to uninoculated broiler chicks in the same pens were studied by sampling ceca and rinses of feathered carcasses in two experiments. Half of the day-old chicks in pens were orally inoculated with a nalidixic-acid-resistant strain of Salmonella Typhimurium at three levels of inoculum (0.1 mL delivering approximately 4 X 102, 104, or 106 cfu). At 3, 6, and 8 weeks of age, equal numbers of inoculated and non-inoculated pen mates were individually electrocuted and rinsed in 400 mL of diluent, after which ceca were removed aseptically, with a total of 654 chickens sampled in the two experiments. There were no differences in Salmonella incidence between inoculated and non-inoculated birds at any age, so the marker Salmonella was well distributed within pens. Total incidence was 70%, 86%, and 83% at the 102, 104, and 106 inoculum levels, respectively. Considering both cecal and rinse samples, incidence was 81%, 84%, and 72% at 3, 6, and 8 weeks of age respectively. There were 95 positives in the cecal samples only, 149 positives in the rinses only, and 277 positives in both ceca and rinse samples, so sampling either ceca or carcass rinses alone underestimated the total incidence of the marker Salmonella.
  N.A. Cox , B.L. McLendon , J.L. Wilson , C.L. Hofacre , M.E. Berrang , A. Hinton, Jr and D.E. Cosby
  Background and Objective: Poultry is a major source of Salmonella and Campylobacter involving human illness. Several body openings of the young chick are exposed to bacteria. The objective of this study was to determine how long artificially inoculated Salmonella or Campylobacter persist in the ceca, spleen and/or liver/gallbladder of broilers. Materials and Methods: Day old chicks (10/isolation unit and 5/floor pen) were orally gavaged with 103 cells of either a marker Salmonella Typhimurium or a marker Campylobacter coli and ceca, spleen and liver/gallbladder were aseptically sampled. Results: All organs from all birds were positive for Salmonella Typhimurium and C. coli at 1 week, most were still positive at 2 and 3 weeks. By 6 weeks, no Salmonella Typhimurium was detected in any tested organs. By 6 weeks all ceca and spleens were positive for Campylobacter coli but none found in liver/gallbladder samples. Conclusion: Translocation of Campylobacter and Salmonella to internal organs and their persistence in these organs are important because these bacteria will not be detected by the currently used methods. Current methods sample the intestinal tract only with drag swabs or fecal samples. Research is needed to understand translocation and persistence of both Campylobacter and Salmonella in poultry.
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