Streptococcus agalactiae, or group B Streptococcus (GBS), is the major caus
e of neonatal meningitis and sepsis but is an uncommon infection in adults.
GBS arthritis is rare, and axial involvement with sacroiliitis is even mor
e uncommon.. Microbiological diagnosis frequently relies upon positive bloo
d cultures as synovial fluid cultures are usually negative. Severe joint da
mage may result due to delay in the initiation of antibiotic treatment.