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# Although exposure to asbestos is the primary cause for

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Although exposure to asbestos is the primary cause for [#permalink]

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18 Nov 2006, 09:57
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Although exposure to asbestos is the primary cause for mesothelioma, a slow-developing cancer, researchers believe that infection by the SV40 virus is a contributing case, since in the US 60 percent of tissue samples from mesotheliomas, but none from healthy tissue, contain SV40. SV40 is a monkey virus; however, in 1960 some polio vaccine was contaminated with the virus. Researchers hypothesize that this vaccine was the source of the virus found in mesotheliomas decades later.

Which of the following, if true, most strongly supports the researchers' hypothesis?

A) SV40 is widely used as a research toll in cancer labaratories.

B) Changes in the technique of manufacturing the vaccine now prevent contamination with SV40

C) Recently discovered samples of the vaccine dating from 1960 still show traces of the virus.

D) In a small percentage of cases of mesothelioma, there is no history of exposure to asbestos.

E) In Finland, where the polio vaccine was never contaminated, samples from mesotheliomas do not contain SV40
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18 Nov 2006, 10:08
SimaQ wrote:
Although exposure to asbestos is the primary cause for mesothelioma, a slow-developing cancer, researchers believe that infection by the SV40 virus is a contributing case, since in the US 60 percent of tissue samples from mesotheliomas, but none from healthy tissue, contain SV40. SV40 is a monkey virus; however, in 1960 some polio vaccine was contaminated with the virus. Researchers hypothesize that this vaccine was the source of the virus found in mesotheliomas decades later.

Which of the following, if true, most strongly supports the researchers' hypothesis?

A) SV40 is widely used as a research toll in cancer labaratories.

B) Changes in the technique of manufacturing the vaccine now prevent contamination with SV40

C) Recently discovered samples of the vaccine dating from 1960 still show traces of the virus.

D) In a small percentage of cases of mesothelioma, there is no history of exposure to asbestos.

E) In Finland, where the polio vaccine was never contaminated, samples from mesotheliomas do not contain SV40

a tentative C...........
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18 Nov 2006, 10:10
Hypothesis: vaccine was the source of the virus found in mesotheliomas

Could be C or E

Though C seems to be stating what is already stated: however, in 1960 some polio vaccine was contaminated with the virus.

In Finland vaccine was never contaminated and mesotheliomas samples do not contain SV40. Hence Sv40 wasn't contracted in any other way in Finland So the vaccine must have been the source of SV40 in US.
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18 Nov 2006, 11:02
In 1960 in US some polio vaccine was contaminated with the SV40 virus and samples of mesotheliomas contain SV40.

In Finland, where the polio vaccine was never contaminated, samples from mesotheliomas do not contain SV40

Therefore, Researchers hypothesize is correct and Finland's example claerly suggests that this vaccine was the source of the SVC40 virus found in esotheliomas

E
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18 Nov 2006, 11:32
I too was confused between C and E. However MST makes two very valid points - C is already stated in the passage and hence provides no additional strengthening premise to the argument.

And E of course corroborates that the absence of contamination in the vaccine and absence of SV40 proves that the SV40 couldn't have been present because of any other reason.
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19 Nov 2006, 04:20
OA is E
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29 Nov 2006, 00:51
Picked wrong on this one too. but E is the best.
29 Nov 2006, 00:51
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# Although exposure to asbestos is the primary cause for

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