Cluster of monophasic Salmonella Typhimurium with previously unseen MLVA pattern in the EU/EEA

Risk assessment
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European Centre for Disease Prevention and Control, Stockholm, 2014

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​This joint rapid outbreak assessment from ECDC and EFSA assesses a cluster of monophasic Salmonella Typhimurium with an MLVA pattern previously unseen in the EU/EEA.

Executive summary

The recently detected 38 cases of monophasic Salmonella Typhimurium with MLVA profile 3-12-17-NA-211 and 3-12-18-NA-211 occurring in six Member States are likely to be part of the same cluster. Given the typing delay and the fact that not all countries are performing MLVA typing, the number of cases currently detected is most likely to be underestimated. 

These two profiles emerged simultaneously in several Member States in June and July 2014, indicating a simultaneous exposure to the clonal strain at several locations within the EU. Based on limited available information from food investigations, meats are the suspected vehicle of human infection at present.

It is important to interview new cases to identify a common exposure and to report all new cases with matching MLVA typing results through the TESSy molecular surveillance service and EPIS FWD in order to assess the evolution of the cluster.  There is a need to gather information on the findings of these MLVA profiles in feed, animals, and foods (of animal origin and non-animal origin) in order to narrow the hypothesis for further epidemiological studies. 

This cluster highlights the need to ensure a rapid exchange of information between the public health and food safety health authorities in order to assess the situation and the need for further epidemiological studies as quickly as possible.