title: The primary cause of rheumatoid arthritis is an infection--the infectious agent exists in milk.
mesh_terms: D000818:Animals; D000906:Antibodies; D000937:Antigen-Antibody Reactions; D001172:Arthritis, Rheumatoid / Q000209:etiology* / Q000276:immunology / Q000382:microbiology; D001431:Bacteriological Techniques; D003470:Culture Media; D005243:Feces / Q000382:microbiology; D006386:Hemagglutination Tests; D006358:Hot Temperature; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008722:Methods; D008892:Milk / Q000382:microbiology*; D009305:Nasopharynx / Q000382:microbiology; D011817:Rabbits; D051381:Rats; D012217:Rheumatoid Factor; D013291:Streptococcus / Q000276:immunology / Q000302:isolation & purification / Q000472:pathogenicity*; D013292:Streptococcus agalactiae; D013582:Synovial Fluid / Q000382:microbiology
chemical_list: D000906:Antibodies; D003470:Culture Media; D012217:Rheumatoid Factor