Infectious Diseases 2021

Infectious Diseases 2021

Salmonella Bareilly and egg powder

Eurosurveillance Volume 26, Issue 14, 08/Apr/2021 1 May, 2021

In August 2017, the number of human S. Bareilly cases reported in the Czech Republic exceeded the maximal annual total number of cases from the previous 5 years (n = 25). The State Veterinary Administration (SVA) identified a Salmonella Bareilly isolate closely related to human outbreak isolates in a powdered egg product called dried egg melange. This led to the agency investigating the company making the powdered egg and inspections at farms that produced eggs for further processing. The first confirmed Salmonella Bareilly patient had disease onset in July 2017. The number of infections peaked in October 2017, and the last confirmed patient was reported in October 2018. In total, 250 probable cases were identified in the Czech Republic and 75 in Slovakia. Two small peaks were observed in Slovakia in October 2017 and April 2018. All age groups were affected in both countries. The highest number of cases was reported in the 1 to 4 years old group. Of 224 Czech cases where data on hospitalisation were available, 69 (31%) required hospitalisation. Hospitalised cases were present in all age groups. In Slovakia, 23 (31%) of 75 cases were admitted to hospital. 
A spray dryer was identified as the source of contamination. The machine underwent repeated cleaning and disinfection. Batch controls were performed from September 2018 until July 2019 and Salmonella Bareilly-positive powdered egg products were repeatedly identified. At the end of June 2019, contamination of the whole technology of the spray dryer was confirmed. In July, all powdered egg items produced since January 2019 were recalled and the facility was closed with a view to rebuilding the technology.