Viral diseases and arthritis.
D001168:Arthritis / Q000209:etiology*; D001172:Arthritis, Rheumatoid / Q000209:etiology; D003141:Communicable Diseases / Q000150:complications*; D006509:Hepatitis B / Q000150:complications; D006801:Humans; D012409:Rubella / Q000150:complications; D014615:Vaccinia; D014777:Virus Diseases / Q000150:complications*