Phenotypic Detection and Biofilm Formation among Pseudomonas aeruginosa Isolated from Different Sites of Infection

Abstract

In The present study, included the collection of (100) samples from different clinical sites. Clinical samples were collected from patients who were visit and admitted All-Hilla teaching hospital at the period from November (2017) to February (2018). Cultural, biochemical and VITEK2 system were used for identification, and depending on the VITEK2 system (VITEK-2 GN Kit), revealed that twenty one (21) Pseudomonas aeruginosa isolates were recovered, The percentage conformational identification of P. aeruginosa was performed using VITEK2 system of (21) P. aeruginosa was (99%). Nine(42.8%) samples were isolated from burns, 5(23.8%) samples from wound, 3(14.2%) from urine, 2(9.5%) from ear swab, and 1(4.7%) sample was isolated from both blood and sputum. The phenotypic detection of some virulence factors for all isolates were detected. Detection of capsule was done by using capsule staining technique was carried out for P. aeruginosa isolates; it was found that all P. aeruginosa isolates (100%) have a capsule surrounding the bacterial cell. Hemolysin production by P. aeruginosa was studied; it was found that 12(57.1%) isolates were able to produce extracellular hemolysin on blood agar. P. aeruginosa isolates were also investigated for their ability to produce siderophores. The results showed that 9(42.8%) isolates of P. aeruginosa were able to produce siderophores. Protease production by P. aeruginosa isolates was studied; it was found that all these isolates (100%) have this enzyme as appear as a zone around the colony when being grown on (M9) media after adding of (3ml) of (5%) Trichloroacetic acid and incubation for (24 hrs.). Ability of P. aeruginosa to produce lipase has been investigated; it found that all these isolates (100%) were able to produce lipase after incubation for (48 hrs.) on egg yolk agar. Also, bacterial biofilms cause chronic diseases that are difficult to control and in the present study, differentiation of bacteria as biofilm producers and non-biofilm producers was done by using (ELISA) TCP method, a total of (21) isolates were tested for their ability to produce biofilm. From these isolates, (19) isolates were form strong biofilm, (2) isolates were form moderate biofilm.