Antimicrobial Resistance and Genetic Diversity of Pseudomonas aeruginosa Strains Isolated from Equine and Other Veterinary Samples

Marine Pottier (1, 2) , Sophie Castagnet (1, 2) , François Gravey (2, 3) , Guillaume Leduc (3) , Corinne Sévin (4) , Sandrine Petry (4) , Jean-Christophe Giard (2) , Simon Le Hello (2, 3) , Albertine Léon (1, 2)

1 LABÉO - LABÉO, Pôle d’analyses et de recherche de Normandie
2 DYNAMICURE - Dynamique Microbienne associée aux Infections Urinaires et Respiratoires
3 Service de Microbiologie [CHU Caen]
4 PhEED - Physiopathologie et épidémiologie des maladies équines

Pseudomonas aeruginosa is one of the leading causes of healthcare-associated infections in humans. This bacterium is less represented in veterinary medicine, despite causing difficult-to-treat infections due to its capacity to acquire antimicrobial resistance, produce biofilms, and persist in the environment, along with its limited number of veterinary antibiotic therapies. Here, we explored susceptibility profiles to antibiotics and to didecyldimethylammonium chloride (DDAC), a quaternary ammonium widely used as a disinfectant, in 168 P. aeruginosa strains isolated from animals, mainly Equidae. A genomic study was performed on 41 of these strains to determine their serotype, sequence type (ST), relatedness, and resistome. Overall, 7.7% of animal strains were resistant to carbapenems, 10.1% presented a multidrug-resistant (MDR) profile, and 11.3% showed decreased susceptibility (DS) to DDAC. Genomic analyses revealed that the study population was diverse, and 4.9% were ST235, which is considered the most relevant human high-risk clone worldwide. This study found P. aeruginosa populations with carbapenem resistance, multidrug resistance, and DS to DDAC in equine and canine isolates. These strains, which are not susceptible to antibiotics used in veterinary and human medicine, warrant close the setting up of a clone monitoring, based on that already in place in human medicine, in a one-health approach.

Mots clés: Pseudomonas aeruginosa; antimicrobial susceptibility; whole-genome sequencing; equine; resistome

Domaines: Médecine vétérinaire et santé animale

Marine Pottier, Sophie Castagnet, François Gravey, Guillaume Leduc, Corinne Sévin, et al.. Antimicrobial Resistance and Genetic Diversity of Pseudomonas aeruginosa Strains Isolated from Equine and Other Veterinary Samples. Pathogens, 2022, 12 (1), pp.64. ⟨10.3390/pathogens12010064⟩. ⟨hal-03975569⟩