Chu K Y, Kpo H K, Klumpp R K
Bull World Health Organ. 1978;56(4):601-8.
In Ghana, Schistosoma haematobium exists as two strains, one transmitted by Bulinus rohlfsi and the other by B. globosus. In Anyaboni, a resettlement town, where the field station of the UNDP/WHO Schistosomiasis Research and Control Project is located, the residents contract the "rohlfsi" strain of the parasite from the Volta Lake and the "globosus" strain from a stream near the town. The present studies indicate that there is mixing of the two parasite strains on a community and an individual basis. In Anyaboni, the parasite developed well in both B. rohlfsi and B. globosus. In another village 25 km from Accra, where B. globosus was the only vector, the parasite developed well in B. globosus but was refractory in B. rohlfsi. In a village near the Volta Lake where B. rohlfsi was the sole vector, the parasite developed well in B. rohlfsi but was refractory in B. globosus. However, complete separation of the two strains is uncommon in Ghana because extensive mixing has already occurred owing to migration of people and snails.
在加纳，埃及血吸虫存在两种菌株，一种由罗氏短沟蜷传播，另一种由球短沟蜷传播。在安亚博尼这个安置镇，开发计划署/世卫组织血吸虫病研究与控制项目的野外工作站就设在此处，居民们从沃尔特湖感染了“罗氏”菌株的寄生虫，从镇附近的一条溪流感染了“球型”菌株的寄生虫。目前的研究表明，这两种寄生虫菌株在社区层面和个体层面都存在混合现象。在安亚博尼，这种寄生虫在罗氏短沟蜷和球短沟蜷体内都能良好发育。在距阿克拉25公里的另一个村庄，球短沟蜷是唯一的传播媒介，这种寄生虫在球短沟蜷体内发育良好，但在罗氏短沟蜷体内则难以发育。在沃尔特湖附近的一个村庄，罗氏短沟蜷是唯一的传播媒介，这种寄生虫在罗氏短沟蜷体内发育良好，但在球短沟蜷体内则难以发育。然而，在加纳，这两种菌株完全分离的情况并不常见，因为由于人和蜗牛的迁移，已经发生了广泛的混合。
