Ivermectin treatment history in the three study areas.
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*Annual treatment in 1988 and 1989; 6-monthly from 1990 onwards.**Increase in number of villages due to establishment of new villages.
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2015-12-02
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*Annual treatment in 1988 and 1989; 6-monthly from 1990 onwards.**Increase in number of villages due to establishment of new villages.