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Peritoneal dialysis-related infections are important morbidity/mortality causes, being staphylococci the most prevalent agents. Since  Staphylococcus aureus  nasopharynx carriage is a known risk factor for PD infections and the oral cavity is a starting point for systemic diseases development, we aimed at comparing the oral staphylococci colonization between PD patients and controls and studying the association with PD-related infections. Saliva samples were plated in Mannitol salt, and isolates were identified by  DnaJ  gene sequencing. Staphylococci PD-related infections were recorded throughout the 4-year period following sample collection.  Staphylococcus  colonization was present in >90% of the samples from both groups (a total of nine species identified). PD patients presented less diversity and less prevalence of multispecies  Staphylococcus  colonization. Although all patients presenting  Staphylococcus epidermidis  PD-related infections were also colonized in the oral cavity by the same agent, only 1 out of 7 patients with ESI caused by  S .  aureus  presented  S. aureus  oral colonization. Staphylococci are highly prevalent in the oral cavity of both groups, although PD patients presented less species diversity. The association between oral  Staphylococcus  carriage and PD-related infections was present for  S. epidermidis  but was almost inexistent for  S. aureus , so, further studies are still necessary to evaluate the infectious potential of oral  Staphylococcus  carriage in PD.

Oral Colonization ofStaphylococcusSpecies in a Peritoneal Dialysis Population: A Possible Reservoir for PD-Related Infections?