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Objectives  Few studies have tested DNA extraction methods to optimize the detection of  Clostridium botulinum  in environmental samples that can be collected during animal botulism outbreaks. In this study, we evaluated four commercial DNA extraction kits for the detection of  C. botulinum  group III in 82 various environmental samples (9 manure, 53 swabs, 3 insects, 8 water, 1 silage and 8 soil samples) collected in a context of animal botulism outbreaks.    Results  The PowerSoil ®  kit was the most efficient for almost all matrices (83.6% of the 73 tested samples), except manure for which the NucleoSpin ®  Soil kit was the most efficient. The NucleoSpin ®  Soil kit enabled detection in 75.3%, the QIAamp ®  DNA Mini Kit in 68.5%, and the QIAamp ®  Fast DNA Stool Mini Kit in 45.2%. However, the NucleoSpin ®  Soil kit detected  C. botulinum  in 9 of the 9 manure samples tested, while the PowerSoil ®  kit found  C. botulinum  in only two samples, and the other two kits in none of the samples. This study showed that PowerSoil ®  can be recommended for DNA extraction from environmental samples except for manure, for which the NucleoSpin ®  Soil kit appeared to be far more appropriate.

Detection of Clostridium botulinum group III in environmental samples from farms by real-time PCR using four commercial DNA extraction kits