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B
Tsetse fly
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C
Sand fly
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D
Mosquito
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Solution
The correct option is B Mosquito Japanese encephalitis virus is transmitted to humans by bites from infected mosquitoes of the Culex species. Humans, once infected, do not develop sufficient viraemia to infect feeding mosquitoes. The virus exists in a transmission cycle between mosquitoes, pigs and/or water birds (enzootic cycle).