Countrywide multi-serotype outbreak of Salmonella Bovismorbificans ST142 and monophasic Salmonella Typhimurium ST34 associated with dried pork sausages in France, September 2020* to January 2021

Maria Pardos de la Gandara (1, 2, 3) , Nelly Fournet (4) , Laetitia Bonifait (5) , Sophie Lefèvre (1, 2, 3) , Marianne Chemaly (5) , Charlotte Grastilleur (6) , Sabrina Cadel-Six (7) , Patrick Fach (7) , Agnès Pignault (6) , Anne Brisabois (8) , Nathalie Jourdan-da Silva (4) , François-Xavier Weill (1, 2, 3)

1 IP - Institut Pasteur [Paris]
2 BPE - Bactéries pathogènes entériques
3 CNR - laboratoire coordonnateur - Centre National de Référence - National Reference Center Escherichia coli, Shigella et Salmonella
4 DSET - Direction santé environnement travail - Santé Publique France
5 Laboratoire de Ploufragan-Plouzané-Niort [ANSES]
6 DGAL - Direction Générale de l'Alimentation
7 LSAl - Laboratoire de sécurité des aliments de Maisons-Alfort
8 DSP - Direction de la Stratégie et des Programmes

The French National Reference Centre for Escherichia coli, Shigella and Salmonella (FNRC-ESS) detected two human clusters of 33 cases (median age: 10 years; 17 females) infected by Salmonella enterica serotype Bovismorbificans, ST142, HC5_243255 (EnteroBase HierCC‑cgMLST scheme) in September-November 2020 and of 11 cases (median age: 11 years; seven males) infected by S. enterica serotype 4,12:i:-, ST34, HC5_198125 in October-December 2020. Epidemiological investigations conducted by Santé publique France linked these outbreaks to the consumption of dried pork sausages from the same manufacturer. S. Bovismorbificans and S. 4,12:i:- were isolated by the National Reference Laboratory from different food samples, but both strains were identified in a single food sample only by qPCR. Three recalls and withdrawals of dried pork products were issued by the French general directorate of food of the French ministry for agriculture and food in November 2020, affecting eight supermarket chains. A notification on the European Rapid Alert System for Food and Feed and a European urgent enquiry on the Epidemic Intelligence Information System for Food and Waterborne Diseases and Zoonoses (EPIS-FWD) were launched. No cases were reported outside France. Outbreaks caused by multiple serotypes of Salmonella may go undetected by protocols in standard procedures in microbiology laboratories.

Mots clés: Bovismorbificans; Salmonella; Typhimurium; cgMLST; multi-serotype; outbreak

Domaines: Sciences du Vivant [q-bio]; Bactériologie

Maria Pardos de la Gandara, Nelly Fournet, Laetitia Bonifait, Sophie Lefèvre, Marianne Chemaly, et al.. Countrywide multi-serotype outbreak of Salmonella Bovismorbificans ST142 and monophasic Salmonella Typhimurium ST34 associated with dried pork sausages in France, September 2020* to January 2021. Eurosurveillance, 2023, 28 (2), pp.2200123. ⟨10.2807/1560-7917.es.2023.28.2.2200123⟩. ⟨anses-03981222⟩