| geographic information system mapping of snakebite incidence in northern ghana and nigeria using environmental indicators: a preliminary study. | snakebite is an important health problem in many parts of rural west africa where the carpet or sawscaled viper, echis ocellatus, is responsible for most of the morbidity and mortality. marked seasonal and geographical variation in the incidence of snakebite suggests an association with environmental factors that could potentially identify high-risk areas and inform health care decision making. this preliminary investigation describes a geographic information system (gis) approach to risk mappin ... | 2003 | 14584375 |