RESUMO
<p><b>OBJECTIVE</b>To further study the role of human cytomegalovirus (HCMV) infection in the pathogenesis of the type 2 diabetes mellitus.</p><p><b>METHODS</b>HCMV DNA levels in sera from 29 type 2 diabetic patients and 23 controls were measured by quantitative polymerase chain reaction (PCR), and comparative analyses was made between HCMV DNA and T cell subsets, blood glucose (BG), insulin (Ins) and C peptide (C-P).</p><p><b>RESULTS</b>The levels of HCMV DNA were (1.81+/-1.67) x 10(8) copies/ml for type 2 diabetic patients, a level significantly higher than that (5.50+/-4.30) x 10(7) copies/ml of controls. The percentage of CD8 for type 2 diabetic patients with positive HCMV DNA was 29.53%+/-2.00%, being much higher than that for controls (27.13%+/-4.12%), while the ratio of CD4/CD8 1.24+/-0.05 was significantly lower than that 1.41+/-0.10 of controls. Fasting C-P of type 2 diabetic patients with positive HCMV DNA was far lower than that of those with negative HCMV DNA, but the differences of BG and Ins between the two groups were not significant.</p><p><b>CONCLUSION</b>Active HCMV infection of type 2 diabetic patients may suppress cellular immunity and its influence on the pathogenesis of the type 2 diabetes mellitus should be further studied.</p>