<prompt> Chandlers Index is used in epidemiological studies of:Round wormHook wormGuinea wormSand fly  <response>: Chandlers index is used to identify the impoance of hookworm infestation as a public health problem in a community. It is calculated based on average number of hookworm eggs gram of stool. Average no. of hookworm eggsgm of stool Significance of hookworm infestation 200 Not much significance 200-250 Potential danger 250-300 Minor public health problem 300 Major public health problem Ref: Parks textbook of Preventive and Social Medicine, 21st edition, page-221 