Polyclonal endemicity of Pseudomonas aeruginosa in a teaching hospital from Brazil: molecular typing of decade-old strains

Abstract

Abstract:Pseudomonas aeruginosa infections cause significant mortality and morbidity in health care settings. Strategies to prevent and control the emergence and spread of P. aeruginosa within hospitals involve implementation of barrier methods and antimicrobial stewardship programs. However, there is still much debate over which of these measures holds the utmost importance. Molecular strain typing may help elucidate this issue. In our study, 71 nosocomial isolates from 41 patients and 23 community-acquired isolates from 21 patients were genotyped. Enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) was performed. Band patterns were compared using similarity coefficients of Dice, Jaccard and simple matching. Strain similarity for nosocomial strains varied from 0.14 to 1.00 (Dice); 0.08 to 1.00 (Jaccard) and 0.58 to 1.00 (simple matching). Forty patterns were identified. In most units, several clones coexisted. However, there was evidence of clonal dissemination in the high risk nursery, neurology and two surgical units. Each and every community-acquired strain produced a unique distinct pattern. Results suggest that cross transmission of P. aeruginosa was an uncommon event in our hospital. This points out to a minor role for barrier methods in the control of P. aeruginosa spread.

Issues of resistance of pathogens to antimicrobial agents

“…The most common infections associated with Pseudomonades include skin infections, urinary tract infections, bronchitis, pneumonia, meningitis, otitis media, endocarditis, bacteremia, mastoiditis and corneal ulcers (Willey et al, 2010). P. aeruginosa infections are the frequent cause of morbidity and mortality in hospitalized patients (Fortaleza et al, 2011;Lanini et al, 2009). Treatment of these infections is complicated by the intrinsic and acquired resistant of the organism to many commonly used antimicrobial agents (Feliziani et al, 2010;Mandsberg et al, 2009).…”