An examination of potential differences in biofilm production among different genotypes of Pseudomonas aeruginosa

Abstract

In the present study, we have examined if there is any difference in biofilm production among different genotypes of Pseudomonas aeruginosa. The study investigated 526 non-duplicate P. aeruginosa isolated from clinical specimens and from a hospital environment. Isolates were grouped into thirty-five genotypes based on an identical ERIC2-band pattern. Biofilm formation was quantified by the microtiter plate test and all strains were classified into the following categories: no biofilm producers (0), weak (+), moderate (+), or strong (+++) biofilm producers. Only 2.45% of examined strains were not biofilm producers. Among biofilm producers, 39.26% were strong biofilm producers, 34.36% were moderate biofilm producers, while 23.93% were weak biofilm producers. Although the majority of strong biofilm producers were in genotype groups 2 and 3, the degree of in vitro biofilm formation in our study was not significantly affected by the genotype of Pseudomonas aeruginosa. In this study, we demonstrated that the degree of in vitro biofilm formation is not significantly affected by the genotype of Pseudomonas aeruginosa.