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Salmonella is a food-borne microorganism that can cause

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Salmonella is a food-borne microorganism that can cause [#permalink] New post 18 Jun 2005, 07:58
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Salmonella is a food-borne microorganism that can cause intestinal illness. The illness is sometimes fatal, especially if not identified quickly and treated. Conventional Salmonella tests on food samples are slow and can miss unusual strains of the microorganism. A new test identifies the presence or absence of Salmonella by the one piece of genetic material common to all strains. Clearly, public health officials would be well advised to replace the previous Salmonella tests with the new test.

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

(A) The new test identifies genetic material from Salmonella organisms only and not from similar bacteria.
(B) The new test detects the presence of Salmonella at levels that are too low to pose a health to people.
(C) Salmonella is only one of a variety of food-borne microorganism that can cause intestinal illness.
(D) The new test has been made possible only recently by dramatic advances in biological science.
(E) Symptoms of Salmonella poisoning are often mistaken for those of other common intestinal illness.
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B it is. [#permalink] New post 18 Jun 2005, 14:01
B is the answer.
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 [#permalink] New post 18 Jun 2005, 14:50
Answer : B

Evidence 1 : Conventional tests are slow and can miss unusal strains
Evidence 2 : New test identifes the presence/absence using one piece of genetice material common to all strains

Conclusion : health officials should replace the old Salmonella test with the new one.

A - strengthens - the fact that it does not identify similar bacteria is irrelevant

B - weakens - because it will detect Salmonella in even in cases where it does not cause any adverse effect. Gives a reason for not changing the test
C - out of scope

D - out of scope
E - generic statement that does not apply to the Tests, so out of scope.
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 [#permalink] New post 20 Jun 2005, 04:18
B.....
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 [#permalink] New post 20 Jun 2005, 08:05
(B)
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Answer [#permalink] New post 20 Jun 2005, 17:22
The OA is B.
Answer   [#permalink] 20 Jun 2005, 17:22
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