Investigation of laboratory testing issues in the context of the Salmonella National Control Programme in Great Britain

The objective of this study was to identify any issues arising during the laboratory testing of samples collected under the National Control Programme for Salmonella. A questionnaire-based survey was conducted among Defra (Department for Environment, Food and Rural Affairs)-approved testing laboratories in order to identify any complicating factors that the laboratories may encounter during the processing of samples. Samples were reported to arrive in good condition and within the specified time frame after collection. The only concern was that new clients may be unaware of the procedure or correct sampling consumables to use. There was evidence of variability between laboratories regarding the sample testing procedure used, with deviation from the guidelines in some cases. This finding suggests that further guidance for laboratories on methodology is likely to be beneficial as this could help improve the detection of low levels of Salmonella.