Kala azar and Oriental Sores are spread by the _

Explanation

Visceral leishmaniasis, also known as kala azar and black fever, is the most severe form of leishmaniasis, a disease caused by parasites of the Leishmania genus. It is transmitted by the sand fly. The adult female sand fly is a bloodsucker, usually feeding at night on sleeping prey. When the fly bites an animal infected with L. donovani, the pathogen is ingested along with the prey's blood. Leishmania tropica produces skin ulcers known as oriental sores or Delhi sores. The disease is spread by sand flies. The parasite lives in the endothelial cells of skin capillaries. It leads to ulcerated wounds with raised edges which do not cause much pain.