<prompt> Prepatent period in lymphatic filariasis is defined as the time interval between inoculation of infective larvae and -Blockage of lymphaticsFirst appearance of detectable microfilariaDevelopment oflymphoedemaDevelopment of adult worm  <response>: Ans. is b i.e., First appearance of detectable microfilaria o The time interval between inoculation of infective larvae and first appearance of detectable microfilaria is known as prepatent period. o The time interval from invasion of infective larvae to the development of clinical manifestations is known as the clinical incubation period -- It is commonly 8-16 months. 