Educational resource · Not a medical device · Infectious diseases review in progress · Does not replace clinical judgement

Diagram — Biofilm and device infection — SeptiMap

describe the biofilm cycle, explain why antibiotics and phagocytes fail against it, and why an infected device often has to be removed. Educational resource, not a medical device.

Diagrams: mechanisms and principles

17 sourced diagrams · for medical students and practice

Each diagram reads step by step: an objective, the steps, three key points, a classic pitfall, its sources and the related atlas pages. Revision mode hides the labels to test yourself.

Clinical years

Biofilm and device infection

Objective: describe the biofilm cycle, explain why antibiotics and phagocytes fail against it, and why an infected device often has to be removed.

Step 7 / 7
Biofilm and device infection1. Adhesion — Bacteria adhere to a surface, such as a catheter or a prosthesis. 2. Microcolonies — They multiply into microcolonies. 3. Maturation — A matrix of extracellular polymeric substances (polysaccharides, proteins, extracellular DNA) wraps the community. 4. Dispersal — Bacteria detach and colonise other surfaces. 5. Antibiotic tolerance — Slow penetration, slowed growth, oxygen-poor microenvironment, and persister cells: a dormant, non-mutant subpopulation whose progeny regrows susceptible. The sources read give a tolerance 10 to 1000 times that of free-living bacteria. 6. Host defences — The biofilm also protects bacteria from phagocytosis. 7. Device infection — Prosthesis and catheter infections involve biofilm; cure often requires removing the device.Device: catheter, prosthesis11 Adhesion22 Microcolonies33 MaturationMatrix (EPS)44 DispersalAntibioticPersistercellsPhagocyteDevice infection: cure oftenrequires removing the device
  • Pathogen
  • Structure
  • Antibiotic
  • Host (cells, tissues)
  • Clinical consequence

Key points

  • Cycle: adhesion, microcolonies, maturation within a matrix, dispersal.
  • The matrix slows antibiotics and phagocytes; persisters tolerate without being mutants.
  • Device infection: removal is often needed to cure.

Classic pitfall

Mistaking biofilm tolerance for genetic resistance: the free-living strain may test “susceptible” while treatment fails.

Related pathogen pages (7)

Sources

Educational content · Illustrative mechanisms · Not applicable to individual clinical decisions · MDR 2017/745

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