[A boy diagnosed SLE after Staphylococcus aureus infection over a long period].

We encountered a 13-year-old boy with SLE who showed specific pathophysiology. The affected child was hospitalized because of long-standing cutaneous empyesis considered to be Staphylococcus aureus infection, followed by manifestation of meningoencephalitis-like symptoms. On a close check up, the patient was diagnosed as having SLE complicated with interstitial lupus nephritis and verrucosis of the left ventricle. Besides the findings, the blastogenesis of the patient's lymphocyte was low against stimulation of sac-1 which connects with the Fc portion of lgG, one of the constituent proteins of Staphylococcus. Moreover, anti-phospholipid antibodies turned positive during immunosuppressive therapy and subcutaneous abscess due to Pseudomonas aeruginosae developed concurrently at about the same time, which posed difficulties in the treatment. The affected child had had Staphylococcus aureus infections over a long period of time before diagnosis of SLE and was susceptible to bacterial infections due to Pseudomonas aeruginosae during the treatment. The clinical course of this case was considered important in presuming the complex immunologically abnormal condition of SLE in childhood.