Multiple choice In Kala-azar, which one of the following is vector? Flea Tsetse fly Sand fly Mite Reveal answer Fill a bubble to check yourself C Correct answer Explanation Kala-azar (Visceral Leishmaniasis) is transmitted by the bite of an infected female sand fly (Phlebotomus argentipes in India). Fleas transmit plague, tsetse flies transmit sleeping sickness (trypanosomiasis), and mites transmit scrub typhus.