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On 17 February 2022, the United Kingdom (UK) reported a cluster of cases with monophasic Salmonella Typhimurium sequence type 34 infection. As of 18 May 2022, 324 cases had been reported in 12 EU/EEA countries and the UK, including two distinct strains.

On 17 February 2022, the United Kingdom (UK) reported a cluster of cases with monophasic Salmonella Typhimurium sequence type 34 infection. By 8 April 2022, 150 cases had been reported in nine EU/EEA countries and the UK. Most cases are below 10 years of age and many children have been hospitalised.

This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 3-9 April 2022 and includes updates on COVID-19, the influx of people displaced from Ukraine to the EU following Russia's invasion of Ukraine, seasonal influenza, hepatitis, monophasic Salmonella Typhimurium, MERS-CoV, chikungunya and dengue.

This report presents the results of the 11th round of the external quality assessment (EQA-11) scheme for typing of Salmonella enterica subsp. enterica organised for the national public health national reference laboratories (NPHRLs) in ECDC’s Food- and Waterborne Diseases and Zoonoses network (FWD-Net) managed by the European Centre for Disease Prevention and Control (ECDC). The EQA-11 scheme was arranged by the Section for Foodborne Infections at the Statens Serum Institut (SSI) in Denmark.