Klebsiella pneumoniae.
D001172:Arthritis, Rheumatoid / Q000382:microbiology*; D005243:Feces / Q000382:microbiology; D006801:Humans; D007711:Klebsiella pneumoniae / Q000302:isolation & purification*; D013167:Spondylitis, Ankylosing / Q000382:microbiology*