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A parasite is an organism that lives on or, in other organisms. A parasite obtains nutrients from the its host in order to grow and live. The human body can play host to these invading monsters.

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Early-Phase Transmission of Yersinia Pestis by Unblocked Fleas as a Mechanism Explaining Rapidly Spreading Plague Epizootics.

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These deadly blood sucking creatures like to dwell in human body.