Wilkins H A
Ann Trop Med Parasitol. 1977 Mar;71(1):53-8. doi: 10.1080/00034983.1977.11687161.
The intensity and prevalence of Schistosoma haematobium infection has been measured in a community in the laterite plateau area of the McCarthy Island Division, The Gambia. The prevalence reaches 100% by the age of 10 years and counts of over 1000 ova in 10 ml of noon urine are common. During the second and third decade prevalence and intensity of infection decline and the mean egg output of a cohort falls by approximately 50% every three years. In subjects aged over 30 sex differences in exposure to infection and egg output suggest the possible effect of protective immunity.
在冈比亚麦卡锡岛分区红土高原地区的一个社区，对埃及血吸虫感染的强度和流行率进行了测量。到10岁时，流行率达到100%，10毫升晨尿中虫卵计数超过1000个的情况很常见。在第二个和第三个十年中，感染的流行率和强度下降，一组人群的平均卵排出量每三年下降约50%。在30岁以上的人群中，感染暴露和卵排出量的性别差异表明了保护性免疫的可能作用。
