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Outbreaks of Rift Valley fever occur irregularly in East

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Outbreaks of Rift Valley fever occur irregularly in East [#permalink] New post 23 Sep 2004, 16:34
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E

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33% (03:38) correct 67% (02:29) wrong based on 4 sessions
Outbreaks of Rift Valley fever occur irregularly in East Africa, several years apart. When outbreaks do occur, they kill thousands of cattle. A livestock vaccine against the disease exists but is rarely used. It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little. Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years.

Which of the following, if true, provides the strongest justification for the experts’ prediction?

A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
C. It would take less than a month for producers of the vaccine to adjust their production operations to cope with a large increase in demand.
D. Many cattle farmers in East Africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of Rift Valley fever.
E. Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.
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 [#permalink] New post 23 Sep 2004, 23:43
A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
- Not useful

B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
- That might have prompted the farmers to use the vaccine a long time back, why wait ? B is out.

C. It would take less than a month for producers of the vaccine to adjust their production operations to cope with a large increase in demand.
- Out of scope

D. Many cattle farmers in East Africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of Rift Valley fever.

E. Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.
- It now enables the use of the vaccine ecnomical since you need to use it only after the climate patterns that leads to the outbreak. So farmers do not have to use it routinely, but rather, at certain times of the year.
E it is.
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 [#permalink] New post 24 Sep 2004, 07:16
OA is E
  [#permalink] 24 Sep 2004, 07:16
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