作者等在喀麦隆Loum地区经过多年来的流行病学调查,观察到两种血吸虫病——间插血吸虫病和埃及血吸虫病在当地流行变迁的情况如下:1968年4～15岁学童500人的调查,发现仅有在粪中排虫卵的间插血吸虫感染,患病率达54.2％,而在尿中未发现虫卵;及至1972年调查225人中24.9％在 After many years of epidemiological investigation in Loum, Cameroon, the authors observed the prevalence of schistosomiasis and schistosomiasis in the region as follows: A survey of 500 children aged 4 to 15 in 1968 , And found that only the interstellar schistosome infection of stool eggs was found with a prevalence of 54.2% and no eggs were found in the urine; and up to 24.9% of 225 surveyed in 1972