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  • Title: Serological detection of chicken flocks naturally infected with Salmonella enteritidis, using an enzyme-linked immunosorbent assay based on monoclonal antibodies against the flagellar antigen.
    Author: van Zijderveld FG, van Zijderveld-van Bemmel AM, Brouwers RA, de Vries TS, Landman WJ, de Jong WA.
    Journal: Vet Q; 1993 Dec; 15(4):135-7. PubMed ID: 8122348.
    Abstract:
    The Dutch Salmonella enteritidis monitoring and eradication programme for poultry prescribes a periodic examination of all breeding flocks for the presence of S. enteritidis. For the first years of the programme this was done by bacteriological examination of 50 faecal samples per visit per flock. In this study we compare the results of bacteriological examination of faecal samples taken at 1580 visits from 545 flocks with those of a S. enteritidis enzyme-linked immunosorbent assay (ELISA) applied on 24 serum samples per visit per flock. Two flocks were found positive for S. enteritidis by bacteriological examination; both flocks were also detected by ELISA. Ten flocks, bacteriologically negative for S. enteritidis were found positive by ELISA. S. enteritidis was isolated from three of these flocks by repeated and extensive bacteriological examination for verification. Verification was not possible in the fourth ELISA positive flock. S. enteritidis infections were likely in three other flocks because of the farm histories. On the basis of the results of this study it was decided to use this ELISA, starting from April 1992, as screening technique in the Dutch S. enteritidis programme instead of bacteriological examination of faecal samples. The ELISA is regarded as a flock test; an extensive, confirmatory bacteriological investigation for S. enteritidis is carried out in ELISA positive flocks to decide whether the flocks are truly infected.
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