A key challenge for one nation’s campaign to improve public health in rural areas was to convince isolated villagers to boil their drinking water in order to kill parasites. The only families who...

A key challenge for one nation’s campaign to improve public health in rural areas was to convince isolated villagers to boil their drinking water in order to kill parasites. The only families who adopted the practice were not well integrated into the village and had few connections to their neighbors. What does this example demonstrate?

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