Sand flies play significant role in spreading kala-azar because they

suck blood only from the patients suffering from kala-azar

convert amastigote into promastigote

engulf amastigote at the time of blood sucking from the infected persons

inject promastigote into the body of non-infected persons at the time of blood sucking

Solution

convert amastigote into promastigote

engulf amastigote at the time of blood sucking from the infected persons

inject promastigote into the body of non-infected persons at the time of blood sucking

Kala-azar is a slow progressing indigenous disease caused by a protozoan parasite of genus Leishmania end spread by the bite of certain types of sandflies.

Sandfly takes a blood meal from the patient of kala-azar and injects its macrophages infected with amastigotes. In sandfly midgut these amastigotes gets transformed into promastigote multiply differentiate into metacyclic promastigotes and migrate to proboscis. Amastigotes again get transferred into the skin of host (non-infected person) at the time of blood sucking.

Some More Questions From Human Health and Disease Chapter

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Human Health And Disease

Some More Questions From Human Health and Disease Chapter

List advantages of good health.

Name three important aspects to maintain good health.

What is disease ?

What is the significance of ‘Typhoid Mary’ ?

Name the most infectious human common ailment and write its causative agent.

Out of four species of malaria which is most serious ?

Name the vector of malaria.

Write the causative agent of (i) amoebiasis and (ii) ascariasis.

Name the disease caused by Wuchereria bancrofti.

List three fungal genera which cause ringworm.

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