Evaluating Personal and Environmental Decolonization Strategies for Children With Skin and Soft Tissue Infection and Their Households — A Randomized Clinical Trial

BACKGROUND: Staphylococcus aureus colonization predisposes to skin and soft tissue infection (SSTI). Given the waning effectiveness of decolonization, we evaluated periodic-personal decolonization and household environmental decontamination to reduce SSTIs among households affected by S. aureus. METHODS: Households of children with community-associated S. aureus SSTI participated in an open-label randomized trial. After baseline decolonization, households were randomized 1:1:1 to a 3-month decolonization intervention: (1) periodic-personal (twice weekly chlorhexidine bathing and monthly intranasal mupirocin application); (2) environmental-hygiene (weekly household surface disinfection and enhanced laundry measures); or (3) integrated-approach of both periodic-personal and environmental-hygiene. Over 9 months, participants and household surfaces were sampled at 5 study visits to detect S. aureus; SSTI incidence was recorded. The primary outcome was household-level cumulative SSTI at 3 months, comparing the integrated-approach to the combined personal-periodic and environmental-hygiene groups. RESULTS: Between 2015 and 2021, 196 index patients and their household contacts (n = 623) were enrolled. Cumulative SSTI incidence did not differ between groups during the 3-month intervention. In index patients and household contacts with SSTI in the year prior to enrollment, SSTI incidence was lower among the integrated-approach at 6- and 9-months compared to the combined periodic-personal and environmental-hygiene groups. In multivariable analyses, prior year SSTI was associated with subsequent SSTI; intervention group was not significant. All interventions reduced methicillin-resistant S. aureus, but not methicillin-susceptible S. aureus, personal colonization over 9 months. CONCLUSIONS: While an integrated-approach of prolonged personal and environmental decolonization reduced SSTIs among participants with prior year SSTI, prior SSTI strongly predicted SSTI incidence longitudinally. Novel prevention strategies are needed.