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Relationships among dengue indices throughout the year in Phitsanulok (District-wise). Average B.I. (base map), average C.I. (inner ring) and average H.I. (outer ring), data was collected with the help of the Ministry of Public Health, Phitsanulok Province. Spokes around the base maps indicate the sampled village locations. The legend colors show the levels of B.I. from low (green) to high (red).
