Acute rheumatoid factor positive (IgM) polyarthritis associated with a Klebsiella pneumonitis

Clin Rheumatol. 1988 Jun;7(2):285-7. doi: 10.1007/BF02204471.


The authors report a case of a patient suffering from acute polyarthritis with a high rheumatoid factor titre, associated with a Klebsiella pneumonitis. A polyclonal B lymphocyte activation or a possible cross reaction between rheumatoid factor and an antigen related to Klebsiella may explain the elevated production of rheumatoid factor observed.

Publication types

  • Case Reports

MeSH terms

  • Acute Disease
  • Arthritis, Infectious / complications*
  • Arthritis, Infectious / metabolism
  • Female
  • Humans
  • Immunoglobulin M / metabolism*
  • Klebsiella Infections / complications*
  • Klebsiella pneumoniae
  • Middle Aged
  • Pneumonia / complications*
  • Pneumonia / metabolism
  • Rheumatoid Factor / metabolism*


  • Immunoglobulin M
  • Rheumatoid Factor