Emerging reservoirs of metallo- upbeta-lactamase genes among non-aeruginosa Pseudomonas and Stutzerimonas species in a Spanish tertiary hospital

IntroductionPseudomonas is one of the largest genera among Gram-negative bacteria, currently comprising nearly 400 valid species. Among them, non-aeruginosa Pseudomonas species, together with Stutzerimonas—a genus recently separated from Pseudomonas—are becoming important reservoirs of antimicrobial resistance genes. However, accurate species-level identification of these organisms remains challenging when relying on the methods routinely implemented in most clinical microbiology laboratories, s