[Ureaplasma urealyticum infection in the genital tract reduces seminal quality in infertile men].

Objective: To understand Ureaplasma urealyticum (Uu) infection, analyzed the influence of Uu infection on the seminal quality and the accessory genetical gland function in male infertility patients, and investigate its mechanism.
Methods: We cultured 202 semen samples collected from male infertility patients and analyzed the influence of Uu infection on seminal parameters and the biochemical indexes of the seminal plasma.
Results: The Uu infection rate was 33.7% in the infertile males, with no statistic differences between the Uu positive and negative groups either in the average age (28.9 +/- 4.7 yrs vs 29.6 +/- 4.0 yrs, P = 0.250) or in the seminal quantity (2.93 +/- 1.32 ml vs 2.86 +/- 1.52 ml, P = 0.774). The sperm density, motility and vitality were (84.37 +/- 52.92) x 10(6) ml, (44.62 +/-22.13) % and (38.40 +/- 15.61) % in the Uu positive group, significantly lower than (101.90 +/- 43.90) x 10(6) ml, (51.83 +/- 19.88) % and (44.45 +/- 15.47) % in the Uu negative group (P = 0.025, P = 0.036 and P = 0.020). The seminal pH value was normal in both of the groups, but significantly higher in the Uu positive than in the negative group (7.32 +/- 0.10 vs 7.19 +/- 0.29, P = 0.003). VCL, VSL, VAP and MAD were significantly lower, while BCF was significant higher in the former than in the latter [(33.97 +/- 8.96) microm/s vs (39.70 +/- 8.14) microm/s, t = 4.113, P < 0.001; (22.29 +/- 6.06) microm/s vs (25.20 +/- 6.67) microm/s, t = 2.684, P = 0.008; (25.96 +/- 6.83) microm/s vs (30.02 +/- 6.81) microm/s, t = 3.537, P < 0.001; 46.60 +/- 13.68 vs 54.23 +/- 15.14, t = 3.112, P = 0.002; (6.12 +/- 1.89) Hz vs (5.22 +/- 1.64) Hz, t = 3. 164, P = 0.002]. All the five indexes were influenced by Uu infection. Compared with the negative group, the seminal plasma alpha-glucosidase was significantly decreased in the positive group [(40.0 +/-18.7) U/ml vs (47.9 +/- 21.0) U/ml, t = 2.248, P = 0.026], and the risk of the decrease was 2.12 times higher. No statistic difference was observed in seminal plasma acid phosphatase and seminal plasma fructose between the two groups.
Conclusion: Uu infection in the genital tract is an important factor of seminal quality reduction in infertile men and may cause a decreased secretion of alpha-glucosidase in the epididymis, but it hardly influences the prostate and seminal vesicle.