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“Nowadays, there are more and more people suffering from mixed infections of multiple sexually transmitted diseases. Look at the 20,000 patients here, 15 percent of them have two or more at the same time.” Zhou Guozheng said.

I think there are two factors. One is social factors, such as frequent business activities, diversified interpersonal communication methods and changes in sexual moral concepts. The second is biological factors, such as transmission by carriers and the development of drug resistance by bacteria. Chi Qingyun said.

In 1999, 840,000 cases were reported on the Chinese......