Comparative performance of three sampling techniques to detect airborne Salmonella species in poultry farms
Elisa Adell 1, Verónica Moset 2, Yang Zhao 3, Ana Jiménez-Belenguer 4, Alba Cerisuelo 5, María Cambra-López 6 1 - Universitat Politècnica de València. Institute of Animal Science and Technology, Valencia, Spain 2 - Instituto Valenciano de Investigaciones Agrarias. Centro de Tecnología Animal, Segorbe, Castellón, Spain 3 - Iowa State University. Department of Agricultural and Biosystems Engineering, Iowa, USA 4 - Universitat Politècnica de València. Department of Biotechnology, Valencia, Spain 5 - Instituto Valenciano de Investigaciuones Agrarias. Centro de Tecnología Animal. Polígono la Esperanza N 100, 12400 Segorbe, Spain. 6 - Universitat Politècnica de València. Institute of Animal Science and Technology, Valencia, Spain. Ann Agric Environ Med 2014; 21 (1): ICID: 1095335 Article type: Original article
Sampling techniques to detect airborne Salmonella species (spp.) in two pilot scale broiler houses were compared. Broilers were inoculated at seven days of age with a marked strain of Salmonella enteritidis. The rearing cycle lasted 42 days during the summer. Airborne Salmonella spp. were sampled weekly using impaction, gravitational settling, and impingement techniques. Additionally, Salmonella spp. were sampled on feeders, drinkers, walls, and in the litter. Environmental conditions (temperature, relative humidity, and airborne particulate matter (PM) concentration) were monitored during the rearing cycle. The presence of Salmonella spp. was determined by culture-dependent and molecular methods. No cultivable Salmonella spp. were recovered from the poultry houses’ surfaces, the litter, or the air before inoculation. After inoculation, cultivable Salmonella spp. were recovered from the surfaces and in the litter. Airborne cultivable Salmonella spp. Were detected using impaction and gravitational settling one or two weeks after the detection of Salmonella spp. in the litter. No cultivable Salmonella spp. were recovered using impingement based on culture-dependent techniques. At low airborne concentrations, the use of impingement for the quantification or detection of cultivable airborne Salmonella spp. is not recommended. In these cases, a combination of culture-dependent and culture-independent methods is recommended. These data are valuable to improve current measures to control the transmission of pathogens in livestock environments and for optimising the sampling and detection of airborne Salmonella spp. in practical conditions.
PMID 24742034 - click here to show this article in PubMed