Comparison of Clostridioides difficile strains from animals and humans: First results after introduction of C. difficile molecular typing and characterization at the Istituto Zooprofilattico Sperimentale of Piemonte, Liguria e Valle d’Aosta, Italy
2021
PCR ribotypes (RTs027 and 078) are known causes of Clostridioides difficile infection (CDI) in humans. Molecular typing and characterization of 39 C. difficile strains isolated from samples from humas and animals in 2016–2018 indicated an overlap of RTs between community-acquired patients (CA-CDI) and domestic animals from the same geographical area; 14 RTs were identified: 12 RTs were positive for toxins A/B; RT078, RT080 and RT126 were also positive for binary toxin (CDT). Most of the RTs from the animals (RTs020, 078, 106, 126) were also detected in the samples from humans. Strains grouped into three clusters: cluster I included prevalently human strains, mainly RT 018; clusters II and III included strains from humans and animals, mainly RT078 and RT020. The CA-CDI strains suggested animals as a reservoir of C. difficile isolated together with other microorganisms from animals, highlighting the association of enteric pathogens as a cause of infection and death.
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