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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]

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16 Oct 2009, 09:44
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Question Stats:

49% (08:52) correct 51% (01:51) wrong based on 378 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 by feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. If the population of these species increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.

Which of the following, if true, 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 that ticks transmit to humans.

[Reveal] Spoiler:
i found the same stem but different question. can anyone explain this?
[Reveal] Spoiler: OA

Last edited by nguyendinhtuong on 27 May 2017, 02:12, edited 2 times in total.
OA updated
If you have any questions
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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16 Oct 2009, 11:30
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Here is the conclusion of the argument.

If the population of these species(species which even after eating infected white-footed mice do NOT pickup bacterium) increased, more of the larvae(deer ticks species) would be feeding on uninfected hosts, so(Conclusion indicator) the number of ticks acquiring the bacterium would likely decline.

In other words, we can say that the argument is concluding by stating that if the population of the species which do not pickup bacterium even after eating infected white-footed mice is increased, then most of the infected white-footed mice will be eaten by these species. And the rest of the food is somewhat better for the deer ticks species and this can reduce to some extent the number of deer ticks acquiring bacterium which inturn reduces the number of humans getting Lyme disease.

Now look at the answer choices – which support this conclusion - reason for deer ticks acquiring bacterium reduction / humans getting the Lyme disease reduction

1. Consequences from carrying bacterium have no impact on the number of humans getting Lyme disease. Rule out this option.
2. Cases of Human’s contracting Lyme disease thru contract is white-footed mice have no impact on reducing the number humans getting Lyme disease. Rule out this option.
3. This looks supporting the conclusion because – deer ticks(a species) feeds only once while at larval stage and at this stage if the feed available is NOT contaminated, then they do not pick up the bacterium and there by reduce the number of humans getting Lyme disease. Possible ans.
4. One host animal being the source for many deer tick larvae to pick up the bacterium --> indicates even with one infected animal many deer ticks can pick up bacterium --> leading to more humans getting Lyme disease. Weakening the conclusion. Rule out this option.
5. Deer ticks getting other bacterium is irrelevant because the argument is taking abt the bacterium leading to Lyme disease. Rule out this option.

My pick is C.

here is a link detailing the explanation on how to solve this question type. (Note that there is slight change in the wordings of the conclusion.)

http://www.manhattangmat.com/forums/post2001.html
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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16 Oct 2009, 13:30
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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 by feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. If the population of these species increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.

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

a. Ticks do not suffer any adverse consequences from carrying the bacterium that causes lyme disease in humans.
This is irrelevant

b. There are no known cases of a human's contracting lyme disease through contact with white-footed mice
Again Irrelevant

c. A deer tick feeds only once while in the larval stage
If they feed once, then by the concept of mathematical probability, the less the proportion of the infected host the less the chances of the spread of the bacterium

d. a single host animal can be the source of bacteria for many tick larvae.
Actually weakens the argument

e. none of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.
Irrelevant

Hope this helps...
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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26 Oct 2009, 10:28
Very similar, but different post at tough-cr-lyme-disease-81209.html
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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01 May 2011, 10:45
Central argument: If populations of *other* species which deer ticks feed on in their larval stage increased, then fewer of the ticks would feed on white-footed mice, then the infection rate of the ticks would go down.

A - strengthens >> if the ticks don't suffer, then more of them survive to carry bacterium

B - irrelevant at best (the ticks are the issue, not the mice), weakens the argument at worst (if the mice have ticks, then argument would suggest contact with and infection of humans)

C - doesn't matter >> whether they feed once or 10x, they still will get the bacterium

D - strengthens >> if it's between one mouse and one "other species" then the effect one way or the other would be magnified

E - irrelevant >> "other bacteria" not in question

IMHO, D is a better answer than A. While A strengthens somewhat, D really makes the point that a single alternative host can mean the difference between lots of ticks getting the bacterium and lots not getting it. Add a few more species and the situation is magnified. Oppositely, take away alternatives to the mice and things get a whole lot worse.

If there's any hole in my reasoning, I welcome comments. As I can benefit from it too
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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19 Aug 2011, 00:24
+1 C, reasons as stated above.

Please post the OA after sufficient discussion, this question is 2 years old and no OA/OE.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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20 Nov 2011, 10:26
OA is C
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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20 Nov 2011, 19:37
i guess it is C
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04 Dec 2011, 05:22
+1 for C
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27 Dec 2011, 22:38
Yes C it is. Thanks for the explanations guys.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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28 Dec 2011, 17:54
+1 C
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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31 Dec 2011, 00:52
As bacteria in larvae stage feeds only once chances are it would feed on the non infected animals as they are more in number hence C.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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27 Feb 2012, 11:48
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Hi All

Could some one help with the cr question below. This is from the GMAT Prep CR.pdf document

Question 54: (S) 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 that

I could not understand the answer choice

Last edited by nguyendinhtuong on 27 May 2017, 02:09, edited 1 time in total.
Merged topic. Please search before posting question.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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27 Feb 2012, 21:17
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raviram80 wrote:
Hi All

Could some one help with the cr question below. This is from the GMAT Prep CR.pdf document

Question 54: (S) 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 that

I could not understand the answer choice

First, you should comprehend the contend of the argument.

Dear ticks contain bacteria (Lyme disease) only in white footed mice, the other species that the dear ticks feed on them do not contain bacteria => Notice: All of the dear ticks are on larvae stage

Conclusion:
IF Other species increase, THEN ticks (have bacteria) & people (get the Lyme disease) will decline

The question is strengthen type. You can also use Negate technique. Negating choice C, If the deer ticks can feed on another stage beside larva stage => Ticks possibly develop on others animals and contain diseases. So, will weaken

=> Choice C is the correct one

Hope that helps
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Last edited by nguyendinhtuong on 27 May 2017, 02:08, edited 1 time in total.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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27 Feb 2012, 21:35
Thanks, still doubt

choice E says this

E. None of the other species on which deer tick larvae feed harbor other bacteria that can cause Lyme

What is wrong with this choice?
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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27 Feb 2012, 23:35
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Choice E talks about other bacteria that also cause Lyme disease, but the argument talks about Lyme disease that is caused by only bacteria transmitted to human according to the argument. The other bacteria, we do not know how it can make human be disease. So, it is out of scope.

P/S: you should edit your choice E in the initial post to help other members see the full meaning. Thanks
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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01 Mar 2012, 21:24
raviram80 wrote:
Thanks, still doubt

choice E says this

E. None of the other species on which deer tick larvae feed harbor other bacteria that can cause Lyme

What is wrong with this choice?

It will be better for me to clarify your mind if you show how do you think choice E is correct. Please, show me how :D.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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31 Mar 2012, 10:32
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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 that

[Reveal] Spoiler:
Why option B is wrong

Last edited by nguyendinhtuong on 27 May 2017, 02:10, edited 1 time in total.
Merged topic. Please search before posting question.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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31 Mar 2012, 18:56
+1 C

If the larvae feeds in a non infected species, it won't have the chance of feeding on an infected one later.
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Re: Lyme disease is caused by a bacterium transmitted to humans [#permalink]

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01 Apr 2012, 14:27
metallicafan wrote:
+1 C

If the larvae feeds in a non infected species, it won't have the chance of feeding on an infected one later.

I guess my question is how do you know they will eat the other species first? Can you elaborate on your answer?

On the other hand, if you know that there no other ways to get the disease then the argument strengthens that the number of people acquiring the disease from ticks exclusively would decrease.
Re: Lyme disease is caused by a bacterium transmitted to humans   [#permalink] 01 Apr 2012, 14:27

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