Five years ago, during the first North American outbreak of : GMAT Critical Reasoning (CR)
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# Five years ago, during the first North American outbreak of

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

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14 Jul 2010, 02:50
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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 showed 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.

I am not mentioning the OA as I dont believe its correct. Let the best option win.
If you have any questions
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14 Jul 2010, 04:07
I would go with D. But yikes this question is a toughie
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14 Jul 2010, 05:28
D . guess a standard GMAT CR involving percentages.
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14 Jul 2010, 05:57
How D weakens the statement?
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14 Jul 2010, 06:20
the death rate from the disease was 5 percent of all reported cases, whereas today the corresponding figure is over 18 percent.

The percent is over the reported cases. As per D
Since the first outbreak, farmers have learned to treat mild cases of CXC and no
longer report them to veterinarians or authorities.

Farmers treat some minor cases and DO NOT report them thus the total reported cases have decreased. So 18 % of less reported cases now may not mean actually more deaths.
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14 Jul 2010, 06:31
Thanks KissGmat.
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15 Jul 2010, 00:30
Premise 1: 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,
Premise 2: whereas today the corresponding figure is over 18 percent.
Premise 3: (HOWEVER)Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities.
Conclusion : It is clear, therefore, that during these past 5 years, CXC has increased in virulence.

KissGMAT wrote:
the death rate from the disease was 5 percent of all reported cases, whereas today the corresponding figure is over 18 percent.

The percent is over the reported cases. As per D
Since the first outbreak, farmers have learned to treat mild cases of CXC and no
longer report them to veterinarians or authorities.

Farmers treat some minor cases and DO NOT report them thus the total reported cases have decreased. So 18 % of less reported cases now may not mean actually more deaths.

gud 1 by kissgmat
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15 Jul 2010, 03:07
is it C???what's the OA?
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27 Jul 2010, 12:15
this is my explanation

this is a causality CR:
the virulence of the CXC is the only reason of the % to weaken this one should come up with an other reason
for instance id farmers treat their cat alone, they can be not well trained and then the ilness will persist

Hope i'm clear
Re: North American outbreak   [#permalink] 27 Jul 2010, 12:15
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