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The study of persistence in mononuclear leukocytes (ML) of blood and synovial fluid of 218 patients with rheumatoid arthritis (RA) Cytornegalovirus (CMV), the 1-st and 2-nd types of Herpes virus simplex (VH), Epstain-Barr virus (VEB), Mycoplasma arthritidis (Ma), Mycoplasma fermentans (Mf), Ureaplasma urealiticum (U), Chlamidia trachomatis (Ct), viruses of Hepatitis B and C was carry out by direct and indirect immunofruorescence, immunoenzymatic analysis and polymerase chain reaction. An increased frequency of contamination of blood ML with infectious agents in patients with RA was established (57,4% compared with 16,7% in control group). The following infectious agents were revieled more frequently: in ML of blood and synovial fluid the Ma (relatively 20,5% and 15,9%), Mf (15,6% and 13,2%), Ct (18,4% and 13,2%), VH (27,1% and 10,5%), VEB (12,7% and 5,3%) and CMV (11,2% and 7,9%). Types of frequency dynamics of ML contamination with these infectious agents in different time phases of RA were determined.

The immunologic study of 412 patient with rheumatoid arthritis (RA) and 52 person of control group has been carried out. The correlation was established between activity of RA and increase in morphologic and functional activity of CD4+-, CD8+- and CD19+-lymphocytes, enhancement of proliferate response and ability to Fas-induced apoptosis of T-cells (r - from 0,5 to 0,81) and between the development of severe systemic complication and increase in percentage of CD8+-lymphocytes with large homogenous nucleoli (r=+0,71+/-0,08), mean diameter of CD8+-lymphocytes nucleus (r=+0,61+/-0,08) and mononuclear leukocytes proliferate response to FGA (r=+0,56+/-0,07). The step based system of assessment of cell immunity disturbances and the criteria of the evaluation of risks of the development of systemic complication in patients with RA were established on the above mentioned parameters development prognosis based on their immune parameters.