Province level Breteau index (B.I.). This map is a visual presentation of B.I., i.e. the number of positive containers per 100 houses inspected, using interpolation techniques on the basis of sampled villages. The legend colors show the levels of B.I. from low (green) to high (red). As per the National Institute of Health (NIH) Thailand, a B.I. of less than 5% is considered to be low risk and greater than 50% is considered to be higher risk.
Sarfraz et al. BMC Public Health 2012 12:853 doi:10.1186/1471-2458-12-853