夫妻“乒乓感染”指以性交招致配偶的连续重复感染。阴道毛滴虫是常见的感染病原体。 阴道毛滴虫分布呈世界性。据Brown(1972)估计全世界阴道毛滴虫感染者约有1.8亿人。妇女感染率一般在青春期后逐渐增高,30～40岁达高峰,更年期后逐渐下降。感染率各地不同,如波兰检查222003名妇女,平均感染率为 Couple “ping-pong infection” refers to a continuous repetitive infection caused by sexual intercourse spouse. Trichomonas vaginalis is a common infectious pathogen. Trichomonas vaginalis distribution is worldwide. According to Brown (1972), there are about 180 million people infected with Trichomonas vaginalis worldwide. The infection rate of women generally increases gradually after puberty, reaches the peak at 30 ~ 40 years old, and then gradually decreases after menopause. Infection rates vary from place to place, as in Poland, 22,2003 women were examined, with an average infection rate of