|Year : 2015 | Volume
| Issue : 2 | Page : 319-320
Biofilm formation by bacterial isolates from patients on indwelling medical devices
M Gogoi1, A Sharma2, NK Hazarika1
1 Department of Microbiology, Gauhati Medical College Hospital, Guwahati, Assam, India
2 Department of Microbiology, Assam Medical College Hospital, Dibrugarh, Assam, India
|Date of Submission||07-Mar-2014|
|Date of Acceptance||23-Sep-2014|
|Date of Web Publication||10-Apr-2015|
Department of Microbiology, Gauhati Medical College Hospital, Guwahati, Assam
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Gogoi M, Sharma A, Hazarika N K. Biofilm formation by bacterial isolates from patients on indwelling medical devices. Indian J Med Microbiol 2015;33:319-20
|How to cite this URL:|
Gogoi M, Sharma A, Hazarika N K. Biofilm formation by bacterial isolates from patients on indwelling medical devices. Indian J Med Microbiol [serial online] 2015 [cited 2019 Dec 11];33:319-20. Available from: http://www.ijmm.org/text.asp?2015/33/2/319/154896
Bioﬁlms are being recognized as an important source of bacterial pathogens especially in those with indwelling medical devices. They also contribute significantly to emergence and dissemination of antibiotic resistance traits in nosocomial setting.  The present study was therefore undertaken to compare the three methods used for detection of biofilm formation i.e. tissue culture plate method (TCP), tube method (TM) and Congo red agar method (CRA) and to study antibiotic susceptibility pattern of the biofilm producers and the non-biofilm producers.
Clinical specimens i.e. blood, urine from urinary catheter, endotracheal tubes, tracheal aspirates, central line tips, drainage catheter specimens were collected from patients with clinical diagnosis of device-associated infections from different ICUs. The 115 bacterial isolates were identified by standard microbiological procedures. The antimicrobial susceptibility testing was done by Kirby-Bauer disc diffusion method. Detection of biofilm formation was done by TCP, TM and CRA method. ,, Biofilm-producing Pseudomonas aeruginosa (ATCC 27853) and non-biofilm forming Staphylococcus aureus (ATCC 25923) and Escherichia More Details coli (ATCC 25922) were used as controls. 
The TCP, TM and CRA detected 61.7%, 41.7% and 18.2% of biofilm producers, respectively [Table 1]. Maximum biofilm producers were isolated from tracheal aspirate and endotracheal tubes (52.1%) followed by blood (17%) and urine (12.6%), respectively. 92.3% of biofilm producing non-lactose fermenters were MDR whereas only 50% non-producers were MDR. Similarly, 72% of biofilm producing enterobacteriaceae isolates were MDR whereas only 57.1% non-biofilm producers were MDR. Fifty percent of biofilm producing S.aureus isolates were MRSA whereas only 33% non-producers were MRSA. A significant association was found between the biofilm producers and multidrug resistance (P value: 0.0125 by Fisher exact test). To conclude, TCP was the most sensitive method. Also, MDR among biofilm producers was significantly higher than non-producers thus, limiting the treatment options. Therefore, emphasis has to be laid on effective biofilm-control strategies.
|Table 1: Showing the quantitative analysis of biofilm production by bacterial isolates as detected by tissue culture plate method |
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