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It is not known whether bovine spongiform encephalopathy

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It is not known whether bovine spongiform encephalopathy [#permalink] New post 17 Dec 2010, 06:04
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E

Difficulty:

  35% (medium)

Question Stats:

82% (02:04) correct 18% (01:12) wrong based on 11 sessions
53. It is not known whether bovine spongiform encephalopathy (BSE), a disease of cattle invariably deadly to them, can be transmitted directly from one infected animal to another at all stages of the infection. If it can be, there is now a reservoir of infected cattle incubating the disease. There are no diagnostic tests to identify infected animals before the animals show overt symptoms. Therefore, if such direct transmission occurs, the disease cannot be eradicated by ____
Which one of the following best completes the argument?
(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE
(B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease
(C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread
(D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late
(E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected
[Reveal] Spoiler: OA
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Re: need help in CR to sort out doubt ?? [#permalink] New post 17 Dec 2010, 22:09
This can be treated as a conclusion question. The correct answer choice will give a conclusion derived from the argument.
The correct option should be A.

Analysis:

Premise / evidence:
1. It is not known whether BSE can be transmitted directly from one infected animal to another at all stages of the infection.
2. There is a probability, that there are a number of infected cattle.
3. There is no diagnostic tests to identify infected animals before the animals show symptoms
Therefore: There is little known about the disease and it is very difficult to identify also it might have already spread.

Conclusion:

Therefore, if such direct transmission occurs, the disease cannot be eradicated by ........

Paraphrase:

Early detection, removing the infected animals.

Options:

(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE
Correct option. Is supported by the evidence given in the argument.

(B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease

Drug might be created even it is not known which animal is infected. If new drug is given to all animals, it will be effective to cure those animals infected.

C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread

It is possible to eradicate the disease by destroying all the cattle and moving to a safer location. Also this idea is not related to evidence presented.

(D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late

Vaccine might be created even it is not known which animal is infected. Since uninfected animals will be immune the disease will be eradicated over time.

(E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected

This is also a possible way to eradicate the disease. If the disease is identified and all the animals with the disease are isolated then the disease will be eradicated.
Re: need help in CR to sort out doubt ??   [#permalink] 17 Dec 2010, 22:09
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