[Invasive pneumococcal disease of serotype 6C with skin and soft tissue infections in an immunocompetent adult].

We report herein on a rare case of deep-soft tissue infection due to invasive pneumococcal disease (IPD). A 77-year-old woman was admitted to our hospital with progressive pain in the right upper arm and the distal leg associated with swelling. We diagnosed the condition as multiple instances of cellulitis that were initially treated with ceftriaxone and clindamycin. Penicillin-susceptible Streptococcus pneumoniae (PSSP) was isolated from blood cultures on admission. Although inflammatory marker levels improved following susceptive antibiotic therapy (ampicillin), multiple abscesses, septic arthritis and osteomyelitis were detected with image testing. The antibiotic was then changed to meropenem and arthroscopic surgery was performed for the right shoulder; the patient's clinical symptoms improved. Since pneumococcal infection including skin and soft tissue infection (SSTI) often causes blood stream invasion or metastatic suppurative complications, metastatic lesions or multiple abscesses should be taken care of.