Question

Kala-azar is caused by

Answer 1

It is caused by sandflies from the protozoan leishmania donovani

Answer 2

Kala-azar(visceral leishmaniasis) is a disease caused by a type of leishmania parasite (Leishmania donovanis). It is spread by sandfly bites.The parasite lives and multiplies in female sandflies. These insects are more active in humid regions during warm weather and at nights.
This particular type of leishmaniasis affects the spleen, liver and bone marrow of the patient.