Lyme Disease Is Caused by a Bacterium Found in the Bloodstream

Lyme disease is caused by a bacterium found in the bloodstream of small woodland rodents such as mice or chipmunks and also found occasionally in deer. Yet humans get this disease without coming into direct contact with either rodents or deer. Explain the concept of a biological vector, and discuss how humans contract Lyme disease.

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Although the bacterium that causes Lyme ...

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