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Lyme disease is caused by a bacterium transmitted to humans

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Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 20 Apr 2009, 18:17
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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 disease—would likely decline.

Which of the following it would be most useful to ascertain in evaluating the argument?

A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white footed mice.

B. Whether the size of the deer population is currently limited by the availability of animals for ticks ‘s larval stage to feed on

C. Whether the infected deer population could be controlled by increasing the number of animals that prey on white footed mice.

D.Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed.

E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmits to humans.


Please help with your explanations, it was a tough one for me.

Thanks!
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 20 Apr 2009, 19:43
jjhko 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 disease—would likely decline.

Which of the following it would be most useful to ascertain in evaluating the argument?

A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white footed mice.---> I feel only is the keyword here. It would have been a better choice without this.

B. Whether the size of the deer population is currently limited by the availability of animals for ticks ‘s larval stage to feed on---> talks abt animal population.

C. Whether the infected deer population could be controlled by increasing the number of animals that prey on white footed mice.---> Already infected..OOO

D.Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed.---> this could increase the Lyme disease at later point of time.

E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmits to humans.---> we are interested in Lyme disease.


Please help with your explanations, it was a tough one for me.

Thanks!


I feel D.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 20 Apr 2009, 21:04
agree with D
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 20 Apr 2009, 23:27
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This is a cause-effect question. For the same effect, if there is an alternate cause, then this will help evaluate the argument.

The conclusion of the argument says that people contracting Lymn desease would decline by increasing number of other species as this would ensure decline in infected deer ticks.

But, if there deer ticks get infection from infected deers then people contracting Lymn desease may not decline.

Hence, D should be the answer.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 26 Oct 2009, 09:33
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 04 Nov 2013, 21:05
As per GMAT Prep the answer is B.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 05 Nov 2013, 18:49
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jjhko 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 disease—would likely decline.

Which of the following it would be most useful to ascertain in evaluating the argument?

A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white footed mice.

B. Whether the size of the deer population is currently limited by the availability of animals for ticks ‘s larval stage to feed on

C. Whether the infected deer population could be controlled by increasing the number of animals that prey on white footed mice.

D.Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed.

E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmits to humans.


Please help with your explanations, it was a tough one for me.

Thanks!


I think OA is B

Read B as

Whether the size of the deer <b>ticks</b> population is currently limited by the availability of animals for ticks ‘s larval stage to feed on

Argument says in order to control lyme disease, increase the number of species that larva feeds on. So larva has multiple options to feed on i.e. feeding on deer sticks, grasshopper, ants etc (grasshopper & ants are just my examples for understanding purposes). As larva has multiple options to feed on, larva is spread across multiple options and less larva feeds on deer ticks..so reduction in lyme disease.

B is asking the question size of population is currently limited by the availability of animals for ticks ‘s larval stage to feed on?
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 08 Apr 2014, 05:16
Please add the OA. I think that someone said that it is B. Also, the correct version of the question is at the following URL http://www.manhattangmat.com/forums/rc- ... t7861.html.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 12 Aug 2015, 10:07
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Lyme disease is caused by a bacterium transmitted to humans [#permalink] New post 12 Aug 2015, 22:33
Here's what the argument states: "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."

They have concluded that they can reduce the number of infected ticks by providing the ticks with an alternative food source that does not have Lyme disease bacterium. Consequently, they hope, the number of infected ticks will decrease, presumably resulting in a lower incidence of ticks infecting people.

The facts provided in the argument do not state or imply any correlation between deer population and the incidence of Lyme disease in people. Therefore, it is inconsequential to the argument whether the deer population is limited by the availability of food source for the deer ticks. Whose to say that the ticks cannot be as prolific in causing Lyme disease with a severely diminished deer population as they are now?

It seems impossible that "B" will be the right answer.

Answer choice "D" directly addresses the point that the population of infected ticks could increase because of an alternative reason - ticks becoming infected later on in their life when they do not feed on white footed mice. Therefore, I certainly find it useful to evaluate whether the plan of reducing the population of infected deer ticks by providing alternative food sources can be undermined by another factor, such as the ticks acquiring infection through other means.
Lyme disease is caused by a bacterium transmitted to humans   [#permalink] 12 Aug 2015, 22:33
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