[Case report: lung abscess caused by Streptococcus agalactiae].

Streptococcus agalactiae is a well-recognized cause of neonatal sepsis and meningitis. In adults, infections by S. agalactiae are rare. We report an adult case of lung abscess and pyogenic spondylitis caused by S. agalactiae. A 51-year-old male was admitted to our hospital because of an abnormal shadow in the chest and lumbago on May 25, 1995. He was diagnosed as lung abscess from the chest roentgenogram and CT scan and the subcutaneous pus was aspirated. The pus culture was only positive for S. agalactiae. He was treated with IPM/CS 1 g/day and CLDM 1.2 g/day and the abscess was drained. MRI showed his lumbago was caused by pyogenic spondylitis. The underlying disease of this case was diabetes mellitus. He recovered from the infections with in about 10 weeks of antibiotic treatment.