Multiple choice Which one of the following insects spreads Kala-azar? Fruit fly Tsetse fly Sand fly Mosquito Reveal answer Fill a bubble to check yourself C Correct answer Explanation Kala-azar (visceral leishmaniasis) is spread by the bite of infected female sand flies belonging to the genus Phlebotomus (Old World) and Lutzomyia (New World). Sand flies transmit the protozoan parasite Leishmania donovani.