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

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02 Mar 2006, 18:03
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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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VP
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Re: CR: Tough Disease [#permalink]

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02 Mar 2006, 20:00
E) None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.
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02 Mar 2006, 20:02
IMO its E
SVP
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02 Mar 2006, 22:12
Guys, don't you think that "E" is already stated in the original evidence?

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.
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02 Mar 2006, 22:42
I initially went for E but on second look C looks more reasonable.
Consider this

A deer tick feeds only once while in the larval stage ....
It feeds only once.if the population of these other species were increased,then the number of instances of deer tick feeding on whitefooted mice decreases.Thus "the number of ticks acquiring the bacterium? and hence the number of people contracting Lyme diseaseâ€”would likely decline."
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03 Mar 2006, 04:36
IMO it should be B)
The conclusion is that the number of people infected is likely to decline.
People get this decease from deer ticks. Deer ticks pick the bacterium from white-footed mice. So if people do not get the decease directly from white-footed mice the conclusion seems to be true
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Re: CR: Tough Disease [#permalink]

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03 Mar 2006, 07:03
Professor wrote:
E) None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.

hmmmmmm....... C make sense.
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03 Mar 2006, 07:54
I would still go with E.

It does NOT say that Lyme is the ONLY disease that deer ticks transmit to humans. There could be other bacteria that these other species carry.
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03 Mar 2006, 10:03
vivek123 wrote:
Guys, don't you think that "E" is already stated in the original evidence?

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.

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

The original argument (the part you put in blue) says that other species on which larvae feed do not contain the Lyme bacteria. However, E puts forward another positive side of the other species. So, this choice strenthens the argument.

^ E ^

is correct here.
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03 Mar 2006, 11:29
Why doesnt D strengthen the argument as well?

I dont think it is E because we are not talking about other diseases but only Lyme disease
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03 Mar 2006, 17:03
B for me. The conclusion says that if the population of this other species increased, there would be less ticks to carry lyme disease and therefore fewer humans get sick. To strengthen the argument, it would have to hold true that humans can't contract lyme disease any other way, hence B, which says, "There are no known cases of a humanâ€™s contracting Lyme disease through contact with white-footed mice."

Also, negate B, and the argument falls apart: There are cases of humans contracting lyme disease from white footed mice, people will still get sick even if fewer ticks carry lyme disease.

vivek, can you please post the OA???
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03 Mar 2006, 20:18
This is a tougher CR from old ETS papers.

The OA is "C"
03 Mar 2006, 20:18
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# Lyme disease is caused by a bacterium transmitted to humans

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