Pretorius S J, Oberholzer G, Van Eeden J A
S Afr Med J. 1976 Jun 12;50(25):968-72.
The Tugela-Vaal River water scheme constitutes a possible source for the introduction of bilharziasis into an area where the disease is at present not endemic. A survey was made of the snail species in the area encompassed by the scheme. Although Bulinus (Physopsis) africanus (a host of Schistosoma species responsible for urinary bilharziasis) was found in the proposed source area of the water scheme, it is not possible at this stage to determine with certainty whether this host will be introduced over the Drakensberg escarpment into the Orange Free State. However, this is a distinct possibility, and it is discussed in relation to ecological factors.
图盖拉-瓦尔河水系可能会将血吸虫病传入目前尚无该病流行的地区。对该水系所涵盖区域的螺蛳种类进行了调查。尽管在该水系拟议的水源地发现了非洲泡螺（布氏泡螺，是导致泌尿生殖系统血吸虫病的血吸虫种类的宿主），但现阶段尚无法确定这种宿主是否会越过德拉肯斯堡山脉悬崖进入奥兰治自由邦。然而，这是一种明显的可能性，并结合生态因素进行了讨论。
