Question

A bite of tsetse fly is most likely to pass to humans

• A. Leishmania donovani
• B. Trypanosoma gambiense
• C. Entamoeba histolytica
• D. Plasmodium vivax

Answer 1

The correct option is B Trypanosoma gambiense

A bite of tsetse fly may pass to humans Trypanosoma gambiense, which is a flagellated protist that causes trypanosomiasis (sleeping sickness), where tsetse flies act as intermediate hosts. The disease gets its name from the fact that patients often exhibit lethargy, drooling from the mouth, insensitivity to pain, slurred speech, seizures, and personality changes.

Leishmania donovani is the causative agent of visceral Leishmaniasis, which is also known as Kala-Azar or Dum Dum fever. It is transmitted by Phlebotomus argentipes (sandfly). The symptoms are continuous fever, anaemia, enlargement of liver, spleen, etc.

Entamoeba histolytica is the causative agent of amoebiasis, tetranucleate cyst is the infective stage. It is transmitted through contaminated water where here houseflies act as mechanical carriers.

Plasmodium vivax is one of the forms (species) of Plasmodium which causes malaria.