O Staphylococcus aureus faz parte da microbiota natural, principalmente da pele, podendo tornar-se patogênico em condições como a quebra da barreira cutânea ou diminuição da imunidade. Os traumas que comprometem a integridade da barreira cutânea constituem-se na principal causa de mudança de comportamento deste microrganismo, para o agente etiológico mais comum de infecções cutâneas 1 2 6 .As infecções mais comuns envolvem a pele (celulite, impetigo) e feridas em sítios diversos. Algumas infecções por Staphylococcus aureus são agudas, piogênicas e podem disseminar para diferentes tecidos e provocar focos metastáticos. Episódios mais graves, como bacteremia, pneumonia, osteomielite, endocardite, ABSTRACTMethicillin-resistant Staphylococcus aureus was initially described as a typical microorganism acquired in nosocomial infections. However, over recent years, community-acquired methicillin-resistant Staphylococcus aureus has been a cause of skin and soft-tissue infections. Serious infections such as pneumonia and sepsis can also occur. This report describes a case of sepsis in a child that was complicated by pneumonia secondary to soft tissue lesions that were due to community-acquired methicillin-resistant Staphylococcus aureus in southern Brazil. The patient was attended at the Emergency Unit with a history of injury caused by lower-limb trauma that evolved to cellulitis, pneumonia and sepsis. Tradicionalmente, as infecções causadas por este patógeno estavam limitadas aos hospitais, porém, a partir da década passada, infecções foram descritas em todo o mundo, de forma
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