Propionibacterium acnes: Time-to-Positivity in Standard Bacterial Culture From Different Anatomical Sites

Rasha Abdulmassih, Jina Makadia, James Como, Michelle Paulson, Zaw Min, Nitin Bhanot

Abstract


Background: Propionibacterium acnes infections are likely under-recognized and underreported. This is partly because of low clinical suspicion, perceived non-pathogenicity, or lack of adequate culture incubation time. We conducted a study to assess the optimal incubation period to recover P. acnes from specimens acquired during the workup of suspected clinical infections.

Methods: A 5-year retrospective chart review was conducted between January 2010 and December 2014 at a single tertiary-care hospital. All patient cases from which P. acnes was recovered were included for analysis. Source of infection, antibiotic use, and culture time-to-positivity (TTP) were recorded.

Results: Implanted devices comprised the single most common source of P. acnes infection. In the majority of cases, P. acnes was the only organism identified. The mean incubation TTP for all isolates was 5.73 days.

Conclusions: Standard 5-day culture incubation periods are insufficient to recover P. acnes. As a result, P. acnes is likely a much more common etiology of a variety of clinical infections than previously reported.




J Clin Med Res. 2016;8(12):916-918
doi: http://dx.doi.org/10.14740/jocmr2753w

 


Keywords


Propionibacterium acnes; Time-to-positivity; Prosthetic joint infection; Implanted electronic cardiac device infection

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