This whole-genome sequencing study asked where the C. acnes cultured at revision shoulder arthroplasty actually comes from. It compared skin strains to deep tissue strains within and across patients. It also used genome-wide association to find which bacterial genes track with true infection.
When you culture C. Acnes at a revision shoulder, this paper tells you the likely source is the patient's own skin, not the lab or the OR air. The genomic match between skin and deep strains (40% clonal vs 0.6% for unrelated patients) is the strongest evidence to date for skin-to-joint translocation at incision.
That reframes prevention: focus on decolonization and source control at the skin, since prep solutions cannot sterilize bacteria hiding in sebaceous glands. Remember that no phylotype is safe. IB and II are modestly enriched, but IA1 and others still cause PJI, so you cannot use sequence type to dismiss a positive culture.
The luxS and tqsA finding gives a mental model for chronic PJI: loss of quorum-sensing genes shifts the organism into a quiet, biofilm-forming persister, which is why these infections are indolent and hard to eradicate.
This whole-genome sequencing study asked where the C. acnes cultured at revision shoulder arthroplasty actually comes from. It compared skin strains to deep tissue strains within and across patients. It also used genome-wide association to find which bacterial genes track with true infection.
When you culture C. Acnes at a revision shoulder, this paper tells you the likely source is the patient's own skin, not the lab or the OR air. The genomic match between skin and deep strains (40% clonal vs 0.6% for unrelated patients) is the strongest evidence to date for skin-to-joint translocation at incision.
That reframes prevention: focus on decolonization and source control at the skin, since prep solutions cannot sterilize bacteria hiding in sebaceous glands. Remember that no phylotype is safe. IB and II are modestly enriched, but IA1 and others still cause PJI, so you cannot use sequence type to dismiss a positive culture.
The luxS and tqsA finding gives a mental model for chronic PJI: loss of quorum-sensing genes shifts the organism into a quiet, biofilm-forming persister, which is why these infections are indolent and hard to eradicate.