In December 2017, two suspected outbreaks of <em>Yersinia enterocolitica </em>4/O:3 were notified in Finland. We analyzed the surveillance and outbreak investigation data and genotyped <em>Y. enteroc...In December 2017, two suspected outbreaks of <em>Yersinia enterocolitica </em>4/O:3 were notified in Finland. We analyzed the surveillance and outbreak investigation data and genotyped <em>Y. enterocolitica</em> strains in order to understand <em>Y. enterocolitica</em> epidemiology in Finland and to find out whether the notified outbreaks were related. A total of 13,344 <em>Y. enterocolitica</em> cases were reported in 1995-2018 to the National Infectious Diseases Register. The mean annual incidence ranged from 7.9 to 15.9/100,000 inhabitants. The highest incidence was observed in young adults (14/100,000). Incidence varied geographically. The incidence was higher in spring compared to other seasons. The most common pathogenic bioserotype was 4/O:3 but the information on bio/serotype was missing in 64% of the surveillance cases. For most of the cases, 87%, no travel history was reported. In the YE 4/O:3 outbreak investigation, whole genome sequencing was performed for isolates from 29/69 (42%) of the outbreak cases. The sequencing results showed that cases consisted of six independent clusters with 2 - 6 isolates in each cluster, and 5 sporadic isolates. No food item was found to be common to all of the clusters. In order to improve monitoring and facilitate the detection and investigation of<em> Y. enterocolitica</em> outbreaks, more comprehensive information on bio/serotype and on travel history is required in the surveillance.展开更多
文摘In December 2017, two suspected outbreaks of <em>Yersinia enterocolitica </em>4/O:3 were notified in Finland. We analyzed the surveillance and outbreak investigation data and genotyped <em>Y. enterocolitica</em> strains in order to understand <em>Y. enterocolitica</em> epidemiology in Finland and to find out whether the notified outbreaks were related. A total of 13,344 <em>Y. enterocolitica</em> cases were reported in 1995-2018 to the National Infectious Diseases Register. The mean annual incidence ranged from 7.9 to 15.9/100,000 inhabitants. The highest incidence was observed in young adults (14/100,000). Incidence varied geographically. The incidence was higher in spring compared to other seasons. The most common pathogenic bioserotype was 4/O:3 but the information on bio/serotype was missing in 64% of the surveillance cases. For most of the cases, 87%, no travel history was reported. In the YE 4/O:3 outbreak investigation, whole genome sequencing was performed for isolates from 29/69 (42%) of the outbreak cases. The sequencing results showed that cases consisted of six independent clusters with 2 - 6 isolates in each cluster, and 5 sporadic isolates. No food item was found to be common to all of the clusters. In order to improve monitoring and facilitate the detection and investigation of<em> Y. enterocolitica</em> outbreaks, more comprehensive information on bio/serotype and on travel history is required in the surveillance.
