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  • Title: Recent microbiological shifts in perianal bacterial dermatitis: Staphylococcus aureus predominance.
    Author: Heath C, Desai N, Silverberg NB.
    Journal: Pediatr Dermatol; 2009; 26(6):696-700. PubMed ID: 20199443.
    Abstract:
    Traditionally, bacterial infections of the anal skin have been found to be caused by Streptococcus. The aim of this study was to determine the breakdown of bacterial isolates and the current presentation of bacterial diseases involving the perineum. From the chart review of children who had bacterial cultures of the anus from 2005 to 2008 in a pediatric dermatology practice population in New York City, 26 pediatric patients (ages 5 months to 12 yrs) who had the indications of anal erythema or recurrent buttocks dermatitis were identified. Bacterial cultures of 17 patients grew pathogens, that of 14 (82% of identifiably infected patients) grew Staphylococcus aureus, in 11 as a solo pathogen (6 MSSA and 5 MRSA in 2 family clusters). Streptococcus was identified in three patients, two on culture and one on latex agglutination test; and two patients were identified as having both group A beta hemolytic Streptococcus and Staphylococcus aureus (2 MSSA and 1 MRSA). In patients with S. aureus perianally, concurrent small papules and pustules of the buttocks or extension of the erythema to adjacent buttock skin was the primary clinical feature distinguishing this condition from isolated streptococcal disease. Whereas Streptococcal infections of the anus and buttocks occur commonly, Staphylococcus aureus has become the leading cause of anal bacterial infection in the setting of skin involvement; therefore, antibacterial therapy for anal and buttock bacterial infections should be tailored accordingly.
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