Question:
Which one of the following is normally NOT transmitted by ticks?
Which one of the following is normally NOT transmitted by ticks?
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African trypanosomes (such as Trypanosoma brucei and Trypanosoma congolense) are classically associated with their vector, the tsetse fly (Glossina spp.).
This distinguishes them from hemoparasites like Babesia, Theileria, and Ehrlichia, which rely heavily on tick vectors.
This distinguishes them from hemoparasites like Babesia, Theileria, and Ehrlichia, which rely heavily on tick vectors.
Updated On: Aug 24, 2026
- Ehrlichia canis
- Babesia canis
- Trypanosoma brucei
- Theileria annulata
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Ticks are prominent vectors of many protozoan, rickettsial, bacterial, and viral pathogens in livestock and companion animals.
However, certain major hemoprotozoan diseases are transmitted exclusively by biting flies.
Step 2: Detailed Explanation:
Let us evaluate the vectors responsible for transmitting each of these pathogens:
- Ehrlichia canis: An intracellular rickettsial pathogen causing canine monocytic ehrlichiosis, transmitted by the brown dog tick, Rhipicephalus sanguineus.
Thus, it is transmitted by ticks.
- Babesia canis: A hemoprotozoan parasite causing canine babesiosis, transmitted to dogs via the bite of infected ixodid ticks, primarily Rhipicephalus sanguineus and Dermacentor reticulatus.
Thus, it is transmitted by ticks.
- Trypanosoma brucei: A flagellated extracellular protozoan causing African trypanosomiasis (Nagana in cattle) in animals and sleeping sickness in humans.
It is biologically transmitted by biting tsetse flies of the genus Glossina, not by ticks.
Thus, it is NOT transmitted by ticks.
- Theileria annulata: A hemoprotozoan causing tropical theileriosis in cattle, biologically transmitted by ixodid ticks of the genus Hyalomma.
Thus, it is transmitted by ticks.
Step 3: Final Answer:
Since Trypanosoma brucei is transmitted by tsetse flies rather than ticks, the correct option is (C).
Ticks are prominent vectors of many protozoan, rickettsial, bacterial, and viral pathogens in livestock and companion animals.
However, certain major hemoprotozoan diseases are transmitted exclusively by biting flies.
Step 2: Detailed Explanation:
Let us evaluate the vectors responsible for transmitting each of these pathogens:
- Ehrlichia canis: An intracellular rickettsial pathogen causing canine monocytic ehrlichiosis, transmitted by the brown dog tick, Rhipicephalus sanguineus.
Thus, it is transmitted by ticks.
- Babesia canis: A hemoprotozoan parasite causing canine babesiosis, transmitted to dogs via the bite of infected ixodid ticks, primarily Rhipicephalus sanguineus and Dermacentor reticulatus.
Thus, it is transmitted by ticks.
- Trypanosoma brucei: A flagellated extracellular protozoan causing African trypanosomiasis (Nagana in cattle) in animals and sleeping sickness in humans.
It is biologically transmitted by biting tsetse flies of the genus Glossina, not by ticks.
Thus, it is NOT transmitted by ticks.
- Theileria annulata: A hemoprotozoan causing tropical theileriosis in cattle, biologically transmitted by ixodid ticks of the genus Hyalomma.
Thus, it is transmitted by ticks.
Step 3: Final Answer:
Since Trypanosoma brucei is transmitted by tsetse flies rather than ticks, the correct option is (C).
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