Chandlerâ€™s index is used to identify the importance of hookworm infestation as a public health problem in a community. It is calculated based on average number of hookworm eggs / gram of stool. <200: no significance 200-250: potential danger 250-300: minor public health problem >300: major public health problem Morbidity and mortality from hookworm infection depend much on the worm load. Chandler worked out an index on the basis of an average number of hookworm eggs per gram of feces for the entire community, which is as below: Average number of eggs per gram of stool Below 200 Hookworm is not of much significance 200â€“250 May be regarded as potential danger 250â€“300 Minor public health problem Above 300 Important public health problem Chandlerâ€™s index is still used in epidemiological studies of hookworm disease. By this index, worm loads in different population groups can be compared and also the degree of reduction of egg output after mass treatment.