iga-class antibodies against chlamydial antigens were positive ( titre greater than or equal to 1:16 ) in 23 of the 24 igg-positive cia-patients ( 96 % ) in contrast to 16 of 40 patients ( 40 % ) with other rheumatic diseases ( ankylosing spondylitis n = 6 ; undifferentiated arthritis n = 11 ; rheumatoid arthritis n = 12 ; degenerative joint disease n = 11 ) , also positive for igg-class chlamydial antibodies .
C0003864
cia
C0003873
rheumatoid arthritis