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Province level house index (H.I.). This map is a visual presentation of H.I., i.e. the percentage of houses infested with larvae, using interpolation techniques on the basis of sampled villages. The legend colors show the levels of H.I. from low (green) to high (red). As per the National Institute of Health (NIH) Thailand, a H.I. of less than 1% is considered to be low risk and greater than 10% is considered to be higher risk.
