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barry barry
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Posts: 11630
12 years ago
Lyme disease is caused by a bacterium found in the bloodstream of small woodland rodents like mice or chipmunks, and is 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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12 years ago
While the bacterium that causes Lyme disease is found in animals, it can be transmitted to humans even if the animal is not present. Small external parasites called ticks bite the animal host and pick up the microbes from the bloodstream. Then they may jump on a human who is passing by and bite them. This bite transmits the bacterium from the tick to the human.
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