| bore holes and the vanishing of guinea worm disease in ghana's upper region. | ghana's upper region provides an excellent example of the beneficial effects of improved water security provided by hand-pump tube wells. following a ghana-canada bilateral development project that installed some 2500 pumps, protection rates against guinea worm disease may be estimated as 88% in the west, and 96% in the east. survey comparisons between ca 1960 and 1990 show that dracunculiasis declined in 32 of a total of 38 areas. the shadow of guinea worm has been lifted from the land and, in ... | 1997 | 9203273 |