Prepatent period&; in lymphatic filariasis is defined as the time interval between inoculation of infective larvae and -: (A) Blockage of lymphatics, (B) First appearance of detectable microfilaria, (C) Development of lymphoedema, (D) Development of adult worm
Answer is B. <p> lymphatic filariasis:- Pre patent period-Time interval between inoculation of infective larvae and first appearance of detectable microfilaria. Clinical incubation period-Time interval from invasion of infective larva to development of clinical manifestation. 8-16 months. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.272}</p>