Occurrence of a New Variant of Salmonella Infantis Lacking Somatic Antigen

Author:

Alessiani Alessandra12ORCID,La Bella Gianfranco1ORCID,Donatiello Adelia1,Occhiochiuso Gilda1,Faleo Simona1,Didonna Antonella1,D’Attoli Luigi1,Selicato Patrizia1,Pedarra Carmine1,La Salandra Giovanna1,Mancini Maria Emanuela1,Di Taranto Pietro1ORCID,Goffredo Elisa1ORCID

Affiliation:

1. Istituto Zooprofilattico Sperimentare della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy

2. Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise, Via Campo Boario 1, 64100 Teramo, Italy

Abstract

Salmonella Infantis is one of the most frequent serovars reported in broilers and is also regularly identified in human salmonellosis cases, representing a relevant public health problem. In the laboratories of the Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata (IZSPB), six Salmonella Infantis strains with antigenic formula -:r:1,5 have been isolated from the litter and carcass of broilers between 2018 and 2022. The strains were investigated to evaluate their phenotype, antibiotic resistance and genomic profiles. Genomic analysis confirmed that the isolates belonged to the Infantis serotype and to the sequence type ST32. Moreover, all strains showed a multidrug-resistant (MDR) profile and were characterised by the presence of the IncFIB plasmid incompatibility group. Three strains had the blaCTX-M-1 gene, and one of them carried IncX1. The presence of this new variant of S. Infantis is particularly relevant because it could expand the landscape of the S. Infantis population. The absence of the somatic antigen could pose a problem in both isolation and serotyping and a consequent public health concern due to the spread of Salmonella infection.

Publisher

MDPI AG

Subject

Virology,Microbiology (medical),Microbiology

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