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Spatial Distribution of Free-of-Charge Pathology Submissions to the California Animal Health and Food Safety Laboratories during the Exotic Newcastle Outbreak in 2002-2003

Gustavo Soberano, Tim E. Carpenter, Carol Cardona and Bruce Charlton
Avian Diseases
Vol. 53, No. 1 (Mar., 2009), pp. 2-6
Stable URL: http://www.jstor.org/stable/25599060
Page Count: 5
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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.
Spatial Distribution of Free-of-Charge Pathology Submissions to the California Animal Health and Food Safety Laboratories during the Exotic Newcastle Outbreak in 2002-2003
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Abstract

After the 1971-1973 outbreak of exotic Newcastle disease (END) in California, a free-of-charge diagnostic submission program was created for backyard poultry flocks. This program was implemented to improve disease surveillance in small poultry flocks. The aim of this study was to evaluate the spatial distribution of free-of-charge pathology submissions to the California Animal Health and Food Safety laboratories during the END outbreak in 2002-2003. Cases and controls were selected from within a 100-mile (161-km) radius of each of three laboratories, and their geographic distributions were evaluated. Global clustering of cases was significant around all three laboratories, with mixed results at the local clustering level and the only significant clustering at the focal level around the Davis laboratory with an observed to expected ratio of approximately 5. The area of influence for all three laboratories was about 20 miles (32 km). The significant clustering of cases around the laboratories indicates that more public information about the free-of-charge program could result in coverage of a larger portion of the population; however, the value of the information resulting from increased sampling should be considered relative to the additional cost of obtaining it. /// Después del brote de la enfermedad de Newcastle exótico en California ocurrido entre los años 1971 y 1973 en el Estado de California, se creó un programa sin costo para el envío de muestras diagnósticas de parvadas de traspatio. Este programa fue instrumentado para mejorar la vigilancia de parvadas avícolas pequeñas. El objetivo de este estudio fue evaluar la distribución espacial de los casos de patología remitidos a los Laboratorios de Salud Animal y Seguridad Alimentaria de California bajo este programa de servicio diagnóstico sin costo, durante el brote de Newcastle exótico de los años 2002 y 2003. Los casos y controles fueron seleccionados en un radio de 100 millas (161 kilómetros) de los tres laboratorios y sus distribuciones geográficas fueron evaluadas. El agrupamiento global de los casos fue significativo alrededor de los tres laboratorios, con resultados mixtos a nivel de las agrupaciones locales y con un solo agrupamiento significativo local alrededor del laboratorio de Davis con un radio observado y esperado de 5. El área de influencia de los tres laboratorios fue de aproximadamente 20 millas, (32 kilómetros). El agrupamiento significativo de casos alrededor de los laboratorios indica que una mayor información al público acerca del programa de diagnóstico sin costo, podría resultar en una cobertura de una proporción mayor de la población. Sin embargo, el valor de la información que resultara de un aumento en el muestreo deberá ser considerado relativo al costo adicional de obtener la información.

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