Theory 045/Medicine & Health /Surgical care
Surgical Infection Is Biofilm Age
Infection is counted as contamination at the time of surgery. What matters may be how long the organisms had to settle.
Surgical site infection is set by the age of the biofilm on the implant rather than by the contamination dose at surgery, so early contamination that matures before the wound closes is more dangerous than a larger dose later.
01The evidence
Implant-associated infections resist antibiotics in proportion to biofilm maturity, and debridement succeeds mainly when performed early.
02The tension
Prevention focuses on contamination at the time of surgery, through prophylaxis and air quality. The timing of maturation is rarely modelled.
03The mechanism
Bacteria that adhere to a surface begin producing a matrix within hours. Once the matrix is established, antibiotics penetrate poorly and the organisms enter a slow-growing state that resists killing.
That makes the interval between contamination and closure the risk variable, and predicts that shortening the open period or disrupting early adhesion should matter more than reducing the total dose.
04What this is not
Dose models count organisms. This counts hours of attachment, which predicts risk from timing at equal dose.
05Predictions
- P1Risk should scale with time to closure.
- P2Early adhesion disruption should reduce infection.
- P3Late large contamination should be less dangerous than early small.
06Refutation
Infection tracking contamination dose at controlled duration would restore the dose model.
07What it changes
It would change prophylaxis timing and wound closure practice.