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Five years ago, during the first North American outbreak

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Five years ago, during the first North American outbreak [#permalink]

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Difficulty:

  95% (hard)

Question Stats:

44% (01:39) correct 56% (01:33) wrong based on 108 sessions

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Five years ago, during the first North American outbreak of the cattle disease CXC, the death rate from the disease was 5 percent of all reported cases, whereas today the corresponding figure is over 18 percent. It is clear, therefore, that during these past 5 years, CXC has increased in virulence.

Which one of the following, if true, most substantially weakens the argument?

(A) Many recent cattle deaths that have actually been caused by CXC have been mistakenly attributed to another disease that mimics the symptoms of CXC.

(B) During the first North American outbreak of the disease, many of the deaths reported to have been caused by CXC were actually due to other causes.

(C) An inoculation program against CXC was recently begun after controlled studies snowed inoculation to be 70 percent effective in preventing serious cases of the illness.

(D) Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities.

(E) Cattle that have contracted and survived CXC rarely contract the disease a second time.

Source: LSAT
[Reveal] Spoiler: OA

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Re: Five years ago, during the first North American outbreak [#permalink]

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New post 03 Oct 2017, 21:19
IMO A since the cause of the disease is some other factor

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Re: Five years ago, during the first North American outbreak [#permalink]

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New post 03 Oct 2017, 22:25
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Imo clear D. The death percentage increased because of the decrease in the number of cases reported.
A and B strengthen the argument.

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Re: Five years ago, during the first North American outbreak [#permalink]

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New post 09 Oct 2017, 22:42
We need to find an argument that weakens the conclusion - "It is clear, therefore, that during these past 5 years, CXC has increased in virulence."

(A) Many recent cattle deaths that have actually been caused by CXC have been mistakenly attributed to another disease that mimics the symptoms of CXC. - If we correct the mistake in this argument then we can see that CXC actually increases the number of deaths. hence, its a strengthener

(B) During the first North American outbreak of the disease, many of the deaths reported to have been caused by CXC were actually due to other causes. - This option talks about the death caused by CXC but we dont know the size of the infected population

(C) An inoculation program against CXC was recently begun after controlled studies snowed inoculation to be 70 percent effective in preventing serious cases of the illness. - Irrelevant

(D) Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities. - If the famers dont report the mild cases whereas the severe ones causes the same amount of deaths. This leads to a fall in total number of reported cases. hence, Correct.

(E) Cattle that have contracted and survived CXC rarely contract the disease a second time. - Irrelevant

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Re: Five years ago, during the first North American outbreak [#permalink]

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New post 14 Oct 2017, 10:33
Suppose, a total of 100 hundred cattle were effected by CXC during its initial outbreak and 5 of them died. In this case the death percentage is 5%

After 5 years even if 100 cattle are effected by the disease and if only 70 are reported to the authorities because the balance 30 had mild syptoms of the disease. Now even if the same number i.e 5 cattle die, the death rate increases as the total number of only 70 cattle are taken into consideration to calculate the death rate.

This weakens the argument's conclusion that the disease has grown in virulence.

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Re: Five years ago, during the first North American outbreak   [#permalink] 14 Oct 2017, 10:33
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Five years ago, during the first North American outbreak

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