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Volume 8, Issue 5 (September 2006) 8, 562–568; 10.1111/j.1745-7262.2006.00190.x

Do Ureaplasma urealyticum infections in the genital tract affect semen quality?

Yan Wang, Cui-Ling Liang, Jun-Qing Wu, Chen Xu, Shi-Xiao Qin and Er-Sheng Gao

1.Shanghai Institute of Planned Parenthood Research, Fudan University, Shanghai 200032, China
2.Department of Epidemiology, Shanghai Institute of Planned Parenthood Research, Shanghai 200032, China
3.Institute of Population Studies, East China Normal University, Shanghai 200062, China
4.Department of Histology and Embryology, School of Medicine, Shanghai Jiaotong University, Shanghai 200025, China

Correspondence: Prof. Er-Sheng Gao, Department of Epidemiology, Shanghai Institute of Planned Parenthood Research, Shanghai 200032, China. Fax: +86-21-6404-6106. E-mail: ersheng_gao@yahoo.com.cn

Received 7 November 2005; Accepted 29 March 2006


Aim: To investigate the relationship between Ureaplasma urealyticum (UU) infection and semen quality.

Methods: From 2001 to 2003, 346 eligible patients aged 20–45 years were invited from two hospitals in Shanghai, China, to participate in an investigation which included questionnaires about general and reproductive health, an external genital tract examination, UU culture and semen analysis. Multiple linear regression models were used to examine whether UU had a significant effect on semen quality after adjustment for confounding factors.

Results: Findings suggested that UU infection was associated with higher semen viscosity and lower semen pH value. Sperm concentration was lower in UU positive subjects than that in UU negative subjects (54.04 106/mL vs.70.58 106/mL). However, UU did not significantly affect other semen quality indexes.

Conclusion: UU infection of the male genital tract could negatively influence semen quality.

Keywords: Ureaplasma urealyticum, semen quality, sperm concentration, seminal plasma, questionnaire, infection

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