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Predictive Value of Multiple Drag-Swab Sampling for the Detection of Salmonella from Occupied or Vacant Poultry Houses

D. J. Caldwell, B. M. Hargis, D. E. Corrier, J. D. Williams, L. Vidal and J. R. DeLoach
Avian Diseases
Vol. 38, No. 3 (Jul. - Sep., 1994), pp. 461-466
DOI: 10.2307/1592066
Stable URL: http://www.jstor.org/stable/1592066
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Predictive Value of Multiple Drag-Swab Sampling for the Detection of Salmonella from Occupied or Vacant Poultry Houses
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Abstract

The results of four independent complete drag-swab samplings of a 31-farm broiler-production complex are described. Samplings of vacant poultry farms (i.e., between flocks) and occupied farms (i.e., containing chickens) were completed in four 3-day intervals beginning in July 1992 and ending in May 1993. During the first two sampling periods, two drag-swab assemblies were dragged through each individual house and pooled into one sample to evaluate overall incidence of Salmonella detection among vacant and occupied houses. During the second two sampling periods, four drag-swab assemblies were dragged through houses to evaluate frequency of Salmonella detection on individual assemblies within each house. Over the four sampling periods, mean isolation frequencies were 42.2% for vacant poultry farms and 76.2% for occupied poultry farms. When four assemblies were dragged in vacant houses and cultured separately, the probability of detecting salmonellae contamination increased with increasing numbers of assemblies, indicating that multiple drag-swab assemblies should be used for sampling either vacant or occupied broiler houses for the presence of Salmonella. On vacant farms, 89.5% of the total isolations occurred in only one house of two-house farms; the remaining 10.5% of farms were positive in both houses. Salmonella isolation from occupied farms occurred in 54.2% of the samplings in only one house, whereas 45.8% of occupied farms were positive in both houses. These data show a higher frequency of Salmonella isolation on multiple swabs in occupied poultry houses, possibly indicating a quantitatively greater presence of Salmonella in these houses. /// Se describen los resultados de 4 muestreos independientes con hisopos de arrastre en una empresa avícola compuesta de 31 granjas de pollos de engorde. El muestreo de granjas vacías y granjas ocupadas fue hecho en cuatro intervalos de tres días, empezando en Julio de 1992 y terminando en Mayo de 1993. Durante los dos primeros períodos de muestreo se tomaron dos grupos de hisopos de arrastre en cada galpón que fueron agrupados en una sola muestra para evaluar la incidencia global de detección de Salmonella entre galpones desocupados y ocupados. Durante el segundo período de dos muestreos, se tomaron 4 grupos de hisopos de arrastre entre los galpones para evaluar la frecuencia de detección de Salmonella en conjunto en cada galpón. Durante los 4 períodos de muestreo, la frecuencia de aislamiento promedio fue de 42.2% para las granjas desocupadas y de 76.2% para las ocupadas. Cuando se tomaron 4 grupos de hisopos en los galpones vacíos y luego se cultivaron por separado, la probabilidad de detección de contaminación por Salmonella aumentó cuando era mayor el número de grupos de hisopos, indicando que deben utilizarse grupos de hisopos múltiples tanto en los galpones ocupados como en los desocupados para detectar la presencia de Salmonella. En granjas desocupadas, el 89.5% del total de aislamientos ocurrió solo en un galpón de granjas de dos galpones; el 10.5% de las granjas restantes fueron positivas en ambos galpones. En las granjas ocupadas el aislamiento de Salmonella ocurrió en el 54.2% en solo un galpón, mientras que 45.8% de las granjas ocupadas fueron positivas en ambos galpones. Estos datos reportan una mayor frecuencia de aislamiento de Salmonella con hisopos de arrastre múltiples en granjas ocupadas, indicando posiblemente una mayor cantidad de Salmonella presente en estos galpones.

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