Epidemiological update: Multi-country outbreak of Listeria monocytogenes PCR serogroup IVb, MLST 6
Since the publication of the rapid risk assessment on a multi-country outbreak of Listeria monocytogenes serogroup IVb, multi-locus sequence type 6 (MLST 6) on 6 December 2017, four EU Member States reported seven new confirmed outbreak cases. Two of these cases were fatal.
As of 6 March 2018, this outbreak has been associated with 32 cases identified between December 2015 and February 2018 (Figure 1). New confirmed cases were reported in Denmark (2), Finland (2), Sweden (1) and the United Kingdom (2). A previously reported case from Finland was excluded because it did not meet the criteria used by the European outbreak case definition. The two new fatal cases were reported in Denmark and in Sweden.
Figure 1. Listeria monocytogenes PCR serogroup IVb, MLST 6; confirmed outbreak cases by month of symptom onset*, European Union, 2015–2018 (n=32)
The outbreak was detected through whole-genome sequencing. Core genome multi-locus sequencing typing (cgMLST) analysis showed that all human isolates cluster by ≤5 allelic differences from the Finnish representative outbreak strain, Listeria monocytogenes MLST 6.
On 5 March 2018, the Finnish Public Health Institute published a news item on this outbreak (in Finnish).
ECDC and the European Food Safety Authority (EFSA) are working on a joint outbreak assessment of this event. Until this is published, the assessment and the conclusions of the previous ECDC rapid risk assessment remain valid.
Rapid risk assessment: Multi-country outbreak of Listeria monocytogenes PCR serogroup IVb, MLST ST6
8 Dec 2017 - A multi-country outbreak of Listeria monocytogenes PCR serogroup IVb, MLST ST6 has been ongoing in the EU/EEA since at least 2015.
Listeriosis is a disease caused by Listeria monocytogenes. The disease primarily causes problems in pregnant women, newborns, and adults with a weakened immune system.Read more
Disease data from ECDC Surveillance Atlas - listeriosis
The Surveillance Atlas of Infectious Diseases is a tool that interacts with the latest available data about a number of infectious diseases. The interface allows users to interact and manipulate the data to produce a variety of tables and maps.Read more