Pasteurella/Yersinia pestis (causal agent of Bubonic Plague) is transmitted by

Bed Bug/Cimex

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Rat Flea/Xenopsylla

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Louse/Pediculus

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Mosquito/Aedes.

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Solution

The correct option is D Rat Flea/Xenopsylla
Yersinia pestis. Yersinia pestis (formerly called Pasteurella pestis) is a short gram-negative rod-shaped bacteria that causes Bubonic plague.
It is a disease of rodents (squirrels, rabbits, rats) that is transmitted to humans by a bite of Rat Flea/Xenopsylla. This occurs when the flea has fed on an infected rodent and bites a human.
It is also transmitted by person-to-person contact through aerosol inhalation.
Hence Pasteurella/Yersinia pestis (causal agent of Bubonic Plague) is transmitted by Rat Flea/Xenopsylla.
So, the correct answer is 'Rat Flea/Xenopsylla'.

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