Infectious Diseases 2020

Infectious Diseases 2020

Salmonella in Denmark in 2019

Source: Annual report on zoonoses in Denmark 2019 4 September, 2020

Human infections with Salmonella remain at a level comparable to previous years with 1,120 cases in 2019, and 1,168 and 1,067 cases in 2018 and 2017, respectively.
S. Enteritidis and S. Typhimurium including the monophasic variant (S. 4,[5],12:i:-) continue to be the most common serotypes with 310 and 272 cases. Nine national Salmonella outbreaks were registered. Three of them were caused by S. 4,[5],12:i:- and in two of these outbreaks Danish produced pork meat was the source. The third outbreak was the largest Salmonella outbreak in 2019 with 57 patients. This outbreak was related to an international investigation with more than 200 registered cases from 2018 to 2019 with a WGS profile that was very similar to the one reported for the Danish outbreak. However the suspected food vehicle for the international cluster of cases was pork meat products and the suspected source in the Danish outbreak was Danish produced minced beef meat.
The lowest Salmonella prevalence in broiler flocks ever reported was observed in 2019 with only 0.3% positive flocks. In Laying hen flocks the Salmonella prevalence was 1.9% which was lower than 2018, where the highest number of positive flocks in more than a decade was reported (2.6%), but still considerably higher than previous years (0 - 1.1%).