Lofgren s disease has been observed frequently in : GMAT Critical Reasoning (CR)
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# Lofgren s disease has been observed frequently in

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Lofgren s disease has been observed frequently in [#permalink]

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23 Oct 2007, 13:44
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Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens. Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease. Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease, however, and chickens ommercially raised for meat, unlike cattle, are generally brought to market during their first year of life.

Which of the following is most strongly supported by the information provided?

A. The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens.
B. There is no way to determine whether a chicken is infected with the Lofgren’s disease virus before the chicken shows symptoms of the disease.
C. A failure to observe Lofgren’s disease in commercial chicken populations is not good evidence that chickens are immune to the virus that causes this disease.
D. An animal that has been infected with the virus that causes Lofgren’s disease but that has not developed symptoms cannot transmit the disease to an uninfected animal of the same species.
E. The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.
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23 Oct 2007, 13:45
Guys........isn't B a straight pick????
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23 Oct 2007, 14:49
I was choosing between B and C but went for B.
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Re: CR - SET28 Q29 [#permalink]

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23 Oct 2007, 16:21

The argument says that "Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease" This does not mean that there is no other way to detect whether the chicken is infected before that. Developing symptoms could be just one way of detecting infection.... you cannot assume it is the ONLY way.

C can be pretty much supported by the premises given in the argument. Just because there are no symptoms does not mean the chicken is not infected... since it takes more than a year to detect the symtoms.

singh_amit19 wrote:
Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens. Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease. Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease, however, and chickens ommercially raised for meat, unlike cattle, are generally brought to market during their first year of life.

Which of the following is most strongly supported by the information provided?

A. The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens.
B. There is no way to determine whether a chicken is infected with the Lofgren’s disease virus before the chicken shows symptoms of the disease.
C. A failure to observe Lofgren’s disease in commercial chicken populations is not good evidence that chickens are immune to the virus that causes this disease.
D. An animal that has been infected with the virus that causes Lofgren’s disease but that has not developed symptoms cannot transmit the disease to an uninfected animal of the same species.
E. The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.
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23 Oct 2007, 19:40
Quote:

The argument says that "Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease" This does not mean that there is no other way to detect whether the chicken is infected before that. Developing symptoms could be just one way of detecting infection.... you cannot assume it is the ONLY way.

C can be pretty much supported by the premises given in the argument. Just because there are no symptoms does not mean the chicken is not infected... since it takes more than a year to detect the symtoms.

Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens.

So we already know that chickens is not immune to disease so "C" is not making much sense trying to point out the fact that chickens are immune to the disease.
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24 Oct 2007, 07:07
What is the OA?
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24 Oct 2007, 09:04
abiswas wrote:
What is the OA?

OA is C
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Re: CR - SET28 Q29 [#permalink]

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24 Oct 2007, 09:14
singh_amit19 wrote:
Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens. Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease. Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease, however, and chickens ommercially raised for meat, unlike cattle, are generally brought to market during their first year of life.

Which of the following is most strongly supported by the information provided?

A. The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens.
B. There is no way to determine whether a chicken is infected with the Lofgren’s disease virus before the chicken shows symptoms of the disease.
C. A failure to observe Lofgren’s disease in commercial chicken populations is not good evidence that chickens are immune to the virus that causes this disease.
D. An animal that has been infected with the virus that causes Lofgren’s disease but that has not developed symptoms cannot transmit the disease to an uninfected animal of the same species.
E. The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.

I picked B too, and I still don't understand OA's reasoning. The first sentence states that the virus is found, but only rarely. In statement C, it says that the "it is not good evidence that chickens are immune to the virus". Immunity to the virus is not a question here since some chickens have already been spotted.

The point of the passage is "Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens"
and the reason why its spotted rarely is because SYMPTOMS are the only way someone can tell if chickens have the virus - meaning there is no other way of finding out if the chicken has a virus other than purely going by symptoms - answer B.

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Re: CR - SET28 Q29 [#permalink]

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24 Oct 2007, 10:20
stopper5 wrote:
singh_amit19 wrote:
Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens. Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease. Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease, however, and chickens ommercially raised for meat, unlike cattle, are generally brought to market during their first year of life.

Which of the following is most strongly supported by the information provided?

A. The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens.
B. There is no way to determine whether a chicken is infected with the Lofgren’s disease virus before the chicken shows symptoms of the disease.
C. A failure to observe Lofgren’s disease in commercial chicken populations is not good evidence that chickens are immune to the virus that causes this disease.
D. An animal that has been infected with the virus that causes Lofgren’s disease but that has not developed symptoms cannot transmit the disease to an uninfected animal of the same species.
E. The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.

I picked B too, and I still don't understand OA's reasoning. The first sentence states that the virus is found, but only rarely. In statement C, it says that the "it is not good evidence that chickens are immune to the virus". Immunity to the virus is not a question here since some chickens have already been spotted.

The point of the passage is "Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens"
and the reason why its spotted rarely is because SYMPTOMS are the only way someone can tell if chickens have the virus - meaning there is no other way of finding out if the chicken has a virus other than purely going by symptoms - answer B.

I also have the same line of thoughts as yours.....only reason i can come up with to negate B is it's an extreme choice ONLY, which should be avoided on GMAT-CRs as KAPLAN says Not a good point i know!!!
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Re: CR - SET28 Q29 [#permalink]

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24 Oct 2007, 16:15
Like most I shortlisted to B and C. Ended up picking B.
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Re: CR - SET28 Q29 [#permalink]

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24 Oct 2007, 18:17
stopper5 wrote:
The point of the passage is "Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens"
and the reason why its spotted rarely is because SYMPTOMS are the only way someone can tell if chickens have the virus - meaning there is no other way of finding out if the chicken has a virus other than purely going by symptoms - answer B.

I dont know why everyone is convinced that symptoms is the ONLY way to tell if chickens have the virus. The passage does not say so anywhere. Why are you assuming that?
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24 Oct 2007, 18:44
A.Haung wrote:
Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens.

So we already know that chickens is not immune to disease so "C" is not making much sense trying to point out the fact that chickens are immune to the disease.

It would NOT make sense if it was trying to point that chickens are immune to the disease.

But C is making a perfectly valid statement when it says that just because you fail to observe the disease in commercial chicken populations it does NOT PROVE that chickens are immune to the disease.

While statement B is going too far in saying that there is NO way to determine whether a chicken is infected before you see symptoms. Nothing in the argument says that symptoms are the only way.
24 Oct 2007, 18:44
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