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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] New post 29 Nov 2006, 07:57
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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.
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Re: CR on CXC! [#permalink] New post 29 Nov 2006, 08:11
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. Strengthens
(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. Strngthens
(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. OOS
(D) Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities.
Since mild cases are not reported the total reported cases have decreased, deaths acccount for higher percent of reported case

(E) Cattle that have contracted and survived CXC rarely contract the disease a second time OOS
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 [#permalink] New post 29 Nov 2006, 08:18
B.

If deaths were not reported, that means that the percentage should have been greater than 5 percent. That weakens the fact that the virus has gained in virulence.
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 [#permalink] New post 29 Nov 2006, 09:34
D. Same reasoning as Damager's
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 [#permalink] New post 29 Nov 2006, 11:14
Very good Q

D is my answer
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Re: CR on CXC! [#permalink] New post 29 Nov 2006, 19:06
Damager wrote:
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. Strengthens
(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. Strngthens
(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. OOS
(D) Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities.
Since mild cases are not reported the total reported cases have decreased, deaths acccount for higher percent of reported case

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


Same as Chief Surgeon CR. Only chronic cases are reported to verterinarians, and hence the high death rates.
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 [#permalink] New post 29 Nov 2006, 20:34
Hmm...I got B
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 [#permalink] New post 29 Nov 2006, 21:25
D !
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 [#permalink] New post 29 Nov 2006, 21:31
D...?
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 [#permalink] New post 29 Nov 2006, 21:56
D by poe.
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 [#permalink] New post 30 Nov 2006, 01:10
D
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 [#permalink] New post 30 Nov 2006, 01:20
karlfurt wrote:
B.

If deaths were not reported, that means that the percentage should have been greater than 5 percent. That weakens the fact that the virus has gained in virulence.


I'm didn't read the sentence correctly :twisted:
Actually it strenghtens the arg and go for D.
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 [#permalink] New post 30 Nov 2006, 02:13
OA=D!
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 [#permalink] New post 30 Nov 2006, 08:36
Late but D.
  [#permalink] 30 Nov 2006, 08:36
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