Longitudinal Monitoring of Two Commercial Layer Flocks and Their Environments for Salmonella enterica Serovar Enteritidis and Other Salmonellae

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Abstract
Between August 20, 2001, and September 17, 2002, 1429 samples including drag swabs, egg belt or egg rollout swabs, fan-blade swabs, rodent organ and intestinal pools, beetle (Alphitobius diaperinus) pools, housefly (Musca domestica) pools, chicken organ and intestinal pools, and egg pools were obtained for Salmonella culture from two flocks from two different commercial layer ranches. The two ranches were purposefully selected for the study based on their previous status of Salmonella Enteritidis isolation using environmental drag swabs in cooperation with practicing veterinarians. Salmonella sp. was isolated from 337 out of 979 (34.42%) non-egg samples. No Salmonella was isolated from 450 egg pools collected from either ranch. S. enteritidis was isolated from samples obtained from ranch 1 from manure drag swabs, 4/284 (1.4%); rodent organs, 1/24 (4.2%); and housefly pool cultures 1/21 (4.8%). Salmonella Enteritidis was isolated from ranch 2 from mouse organ and intestinal pool samples, 1/24 (4.2... Resumen Evaluación a través del tiempo de Salmonella enterica serovar enteritidis y otras Salmonellas en dos lotes de ponedoras comerciales y su medio ambiente. Entre agosto 20 de 2001, y septiembre 17 de 2002, se obtuvieron 1429 muestras entre las cuales se encontraban hisopos de barrido, hisopos de correas o rodillos de recolección de huevos, hisopos de aspas de los ventiladores, grupos de órganos e intestinos de roedores, grupos de escarabajos de la cama (Alphitobius diaperinus), grupos de moscas domésticas (Musca domestica), grupos de órganos e intestinos de ponedoras comerciales, y grupos de huevos para realizar cultivos bacteriológicos para Salmonella en dos lotes de ponedoras comerciales localizados en dos granjas. Para este estudio, las dos granjas fueron seleccionadas intencionalmente con base en su estado anterior con respecto al aislamiento de Salmonella enteritidis empleando hisopos de barrido del medio ambiente, en cooperación con médicos veterinarios practicantes. Se aislaron 337 (34.42%) Sa...

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