Magaro' M, Altomonte L, Zoli A, Mirone L, Berchicci M C
Divisione Di Reumatologia, Istituto di Clinica Medica, Universita' Cattolica S. Cuore Rome, Italy.
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.