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Background   Pseudomonas aeruginosa  is a Gram-negative bacteria responsible for infections in immunocompromised patients and is one of the most common causes of nosocomial infections particularly in intensive care and burn units. We aimed to investigate the population structure of  P. aeruginosa  strains isolated from patients at different hospital wards. Methods: We analysed the possible presence of  P. aeruginosa  epidemic or endemic strains in hospitals of the selected region. A genotyping analysis was performed for  P. aeruginosa  isolates ( n  = 202) collected from patients of eleven hospitals in north-western Poland. Collections of  P. aeruginosa  were genotyped using pulsed-field gel electrophoresis (PFGE). Phenotypic screening for antibiotic susceptibility was performed for the common antimicrobial agents.    Results   Pseudomonas aeruginosa  isolates were distributed among 116 different pulsotype groups. We identified 30 groups of clonally related strains, each containing from 2 to 17 isolates and typed the obtained 13 unique patterns, designated as A, D, E, J, K, M, N, Ó, P, T, X, AC, AD, and AH. The two largest clusters, D and E, contained 17 and 13 isolates, respectively. Strains of these groups were continuously isolated from patients at intensive care units and burn units, indicating transmission of these strains.    Conclusions  In this study, we demonstrate the clonal relatedness of  P. aeruginosa  strains and their constant exchange in hospitals over a period of 15 months. The obtained results indicate a predominantly non-clonal structure of  P. aeruginosa .

bmc infectious diseases

Genotypic characterisation and antimicrobial resistance of Pseudomonas aeruginosa strains isolated from patients of different hospitals and medical centres in Poland