National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine treatment outcome research support non-u.s. gov't female male adolescent Child Infant Skin Diseases preschool Randomized Controlled Trial Double-Blind Method anti-bacterial agents / adverse effects trimethoprim anti-bacterial agents / therapeutic use* bacterial / microbiology abscess / drug therapy* bacterial / drug therapy* drainage abscess / microbiology sulfamethoxazole drug combination / therapeutic use* staphylococcal skin infections / drug therapy pmid:19409657 doi:10.1016/j.annemergmed.2009.03.014 myto duong stephen markwell stephen barenkamp methicillin-resistant staphylococcus aureus / drug effects sulfamethoxazole drug combination / adverse effects