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Sandfly play significant role in spreading kala azar bacause they I. Suck blood only from the patients suffering from kala azar. II. Covert amastigote into promastigote. III. Engulf amastigote at the time of blood sucking from the infected persons. IV. inject promastigote into the body of non-infected person at the time blood sucking.A. I and IIB. II and IIIC. II, III and IVD. III and Iv |
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Answer» Correct Answer - C Kala - azar is a slow progressive indigenous disease caused by a protozoan parasite leishmania and spread by the bite of certain types of vector in sandflies. Sandflies takes a blood meal from the patient of kala-azar and injects its macrophages infected with amastigotes. In the midgut of sandfly, these amastigotes get transformed into promastigotes and migrate to proboscis. Amastigotes again get transferred into the skin of host (non-infected person) at the time of blood sucking. |
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