Overview
A biofilm is a structured community of microorganisms enclosed in a self-produced extracellular matrix and typically attached to a biotic or abiotic surface.
Classification
| Stage | Event | Lab implication |
|---|---|---|
| Attachment | Adhesion to surface/device | Early colonization may be occult |
| Maturation | Matrix + microcolonies | Disruption methods may improve yield |
| Dispersal | Planktonic shedding | Intermittent positive cultures |
Morphologic Features
Biofilm is not a Gram morphology. Mucoid colony texture may accompany some biofilm-associated organisms but is nonspecific.
Laboratory Characteristics
- Paired line vs peripheral blood cultures when ordered
- Tip roll / sonicate methods per SOP
- Repeat same-organism recovery pattern
- Quantity and purity documentation
Reference Intervals
Semi-quantitative tip-culture thresholds and sonication cutoffs are method- and institution-specific, verify locally.
Clinical and Laboratory Significance
Biofilm framing supports interpretation of device-related cultures. Significance still requires clinical correlation and local contaminant rules.
Differential Considerations
Distinguish true device-related infection from contamination during removal/processing and from unrelated bacteremia with secondary device colonization.
Comparison Tables
Device-culture pattern cues
| Pattern | Favors biofilm niche | Favors contaminant / other |
|---|---|---|
| Same organism, multiple episodes | Yes | Less likely if single isolate only |
| Line positive earlier than peripheral | Possible line niche | Interpret with draw quality |
| Mixed skin flora, low quantity | Possible colonization/contam | Context-dependent |
Classification Frameworks
Not applicable.
Laboratory Notes
- Follow institutional device-culture SOPs
- Do not recommend catheter removal or therapy in the report narrative
- Hedge quantitative cutoffs as local
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
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