The European Food Safety Authority (EFSA) and the European Centre for Disease Prevention and Control (ECDC) have released a joint Rapid Outbreak Assessment relating to reports of infection with an unusual strain of Salmonella Typhimurium from six EU countries.
To date, 38 cases of infection by monophasic S. Typhimurium with a previously unknown MLVA (multiple-locus variable-number of tandem repeats analysis) pattern have been identified in Denmark, Finland, Germany, The Netherlands, Norway and Sweden. All the cases are thought to be part of the same cluster of infection and probably originate from a single source.
Investigators in Denmark have isolated S. Typhimurium matching the outbreak strain from a sample of meat sold as minced beef and produced using meat from Denmark and one other unknown country. However, probabilistic assessment designed to determine the likely origin of strains isolated from cases in the Netherlands suggests that the most likely source is pigs.
The EFSA/ECDC Assessment states that more cases are likely to be linked to the outbreak as new isolates are typed. Some countries also do not currently undertake MLVA typing routinely, so that additional cases may not yet have been identified as part of the outbreak. The international investigation into the source of infection is continuing.
The Rapid Outbreak Assessment can be found in full here.