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02 Oct 2017, 21:03
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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60% (02:01) correct
40%
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wrong
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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.
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.
13 Apr 2021, 08:30
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broall
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.
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.
OFFICIAL EXPLANATION
(A) No. This substantially strengthens the argument. If many recent deaths due to CXC have been mistakenly attributed to another disease, then the 18 percent death rate would be even higher.
(B) No. This substantially strengthens the argument. If many of the deaths reported to have been caused by CXC were actually due to other causes, then the 5 percent initial death rate would be lower. Hence, the increase in virulence would be even greater.
(C) No. This choice is irrelevant. The effectiveness of an inoculation program has no bearing on the virulence of a disease. Inoculations are used to prevent infection by a disease. However, once infected, the disease’s virulence measures the severity of the sickness. The fact that a disease can often be prevented does not affect its virulence if caught.
(D) Yes. If the mild cases are no longer reported, then the serious cases would be disproportionately represented. For example, suppose of 100 cattle with the disease, 73 have a mild case, 27 have a serious case and 5 will die of the disease. Then the death rate would be 5 percent. Now, if the 77 cattle with mild cases are not considered, then the reported death rate would be approximately 18 percent: 5/27 ≈ 18%.
(E) No. The passage is about the virulence of the disease, not about an animal’s immunity to a second infection.
General Discussion
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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A and B strengthen the argument.
Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
