<prompt> Microfilaria endemicity index is -of a persons showing MF in blood and diseased individualof persons showing MF in blood onlyNumber of MF in the bloodAverage no. Persons with positive slides  <response>: filarial indices 1. Microfilaria rate: percentage of persons showing microfilaria in their peripheral blood 20 cu. mm in sample population, one slide being taken from each person. 2. Filarial endemicity rate: percentage of persons examined showing microfilaria in their blooddisease Manifestation both. 3. Microfilarial density: number of microfilaria per unit volume of blood in samples from individual person. 4. Filarial disease rate. Reference: park;s textbook of preventive and social medicine, 23rd edition, pg no.274 