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What is All of the following are commonly used Filarial indices except - and explain in detail?
<p> 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 blood/disease 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}</p>