Lyme disease is caused by a bacterium transmitted to humans : GMAT Critical Reasoning (CR)
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# Lyme disease is caused by a bacterium transmitted to humans

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Manager
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Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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15 Jul 2005, 08:43
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Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected whitefooted mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium? and hence the number of people contracting Lyme diseaseâ€”would likely decline.

Which of the following, if true, most strengthens the argument?

A. Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.

B. There are no known cases of a humanâ€™s contracting Lyme disease through contact with white-footed mice.

C. A deer tick feeds only once while in the larval stage.

D. A single host animal can be the source of bacteria for many tick larvae.

E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.
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15 Jul 2005, 08:57
I think it's D...
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15 Jul 2005, 09:32
cybera wrote:
Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected whitefooted mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium? and hence the number of people contracting Lyme diseaseâ€”would likely decline.

Which of the following, if true, most strengthens the argument?

A. Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.

B. There are no known cases of a humanâ€™s contracting Lyme disease through contact with white-footed mice.

C. A deer tick feeds only once while in the larval stage.

D. A single host animal can be the source of bacteria for many tick larvae.

E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.

I think the answer is E, by elimination
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15 Jul 2005, 12:48
I will go with B.
If humans contract Lyme disease through contact with white-footed mice then the number of people contracting Lyme disease would not decline in spite of increasing the population of those other species
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15 Jul 2005, 15:09
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Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected whitefooted mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased

most strengthens the argument...

If other species are increased there is less chance of deer ticks picking up the bacterium as the other species cant harbor bacterium

So i go with E

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19 Jul 2005, 07:07
I zeroed down the choices to B and C, and I will go with B.

Let me first explain why the other choices are not pertinent.

A. Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.
> NOT RELEVANT.

B. There are no known cases of a humanâ€™s contracting Lyme disease through contact with white-footed mice.
> If B is true, then increasing other species will not reduce the number of humans and deer tick, that are infected by the bacteria that causes Lyme disease.

C. A deer tick feeds only once while in the larval stage.
> Even if the deer tick feeds more than once, we don't know if they have multiple hosts.

D. A single host animal can be the source of bacteria for many tick larvae.
> Again not relevant. we are not concerned with many tick larvae

E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.
> Not Relevant. We are not concerned about other bacteria.

B can be true, but it does not strenthen the argument, that
19 Jul 2005, 07:07
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# Lyme disease is caused by a bacterium transmitted to humans

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