Detection and Phenotypic Antimicrobial Susceptibility of <i>Salmonella enterica</i> Serotypes in Dairy Cattle Farms in the Po Valley, Northern Italy
2024
Francesca Parolini | Giordano Ventura | Carlo Rosignoli | Sara Rota Nodari | Mario D’incau | Leonardo Marocchi | Giovanni Santucci | Massimo Boldini | Matteo Gradassi
The presence of <i>Salmonella</i> spp. in dairy cattle farms poses a major risk to animal health and welfare. This study focused on <i>Salmonella</i> detection in dairy farms located in the Cremona and Mantua provinces (northern Italy) in samples collected and submitted to laboratories in 2021–2022. A total of 2710 samples from different sources, including calf carcasses/organs (<i>n</i> = 128), rectal swabs (<i>n</i> = 1937), feces (<i>n</i> = 390), bulk milk (<i>n</i> = 93), and overshoes/swabs (<i>n</i> = 127) for environmental sampling, were analyzed for the presence of <i>Salmonella</i> spp. and were included in the present study. Our results indicate that <i>Salmonella</i> was most commonly firstly identified from calf carcasses and organs (61.67%) and that the serotypes most frequently detected in dairies were <i>S</i>. Dublin (38.33%), <i>S</i>. Typhimurium (23.33%), and <i>S</i>. Typhimurium monophasic variant (14.17%). The most common pathological findings in calf carcasses were enteritis, hepatosplenomegaly, and pneumonia. The antimicrobial resistance pattern analyzed using the MIC assay of 51 <i>Salmonella</i> isolates revealed the presence of multi-resistant strains, which pose a major risk to public and animal health.
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