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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Joined: 31 Oct 2011
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Kudos [?]: 893 [1] , given: 18

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

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06 Dec 2011, 22:25
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Difficulty:

75% (hard)

Question Stats:

53% (02:46) correct 47% (02:14) wrong based on 163 sessions

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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 white footed 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 disease 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 human’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

c assumes that a deer tick moves to diffrent species to feed if it feeds more than once, so doesn't matter whether the population of other species increased?
That's why it is the answer?

I kind of understood why c is the answer, but still confused.
[Reveal] Spoiler: OA
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Re: cr 54 Lyme disease is caused by a bacterium transmitted [#permalink]

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07 Dec 2011, 00:17
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Re: cr 54 Lyme disease is caused by a bacterium transmitted   [#permalink] 07 Dec 2011, 00:17
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