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Outbreaks of Rift Valley fever occur irregularly in East Africa, sever

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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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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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 27 Feb 2013, 11:02
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Outbreaks of Rift Valley fever occur irregularly in East Africa, several years apart.

Ok this is a fact. Outbraks can occur every 4 years as well as after 10 years

When outbreaks do occur, they kill thousands of cattle.

Ok. A fact, 1000 cows will die

A livestock vaccine against the disease exists but is rarely used.

The vaccine ir rarely use. Unitll now we do not know why is not 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.

The vaccine has costs and is better use before an outbreak

Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years.

here is something that is weird: basically the argument says that the vaccine is unuseful but its use will increase over time. We need something that explain clearly THAT

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.

Who carrier the outbreal is irrelevant. It doen't explain WHY there will be an increase in the use of the vaccine

B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.

What the other country do is not so relevant for our discrepancy

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.

Production and demand is completely irrelevant here.

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.

This seems to me a statistic rather a good explanation why we will use more vaccine inthe next future. Doesn't seem good as option


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.

OKKKK. A research (so something that is reliable) sayas a prediction. So if this is true (and we know that is true because we cannot disprove the information given) we will have an increase in the use of the vaccine as prevention

E is the answer
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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fozzzy wrote:
Can someone provide a detailed analysis on this one. Thanks!


Vaccine's drawbacks:
I)It is too expensive
II)It is not effective until a month after vaccination

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?

What answer are we looking for? It will be something that will eliminate a current defect of the vaccine, or will be an advantage that will balance everything: like "has been found that the vaccine makes the cattle immune to every type of disease and increases its reproductivity rate"(I'm making this up).

A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
Irrelevant.
B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
Maybe... this could be seen as an advantage to use the vaccine, because revenues for the farmers could be lower if they do not use it. We can keep it for now...
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.
Irrelevant because it does not offer an argument like those described above.
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.
This is just a fact that has no impact on the prediction.
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.
This seems good as well because undermines the drawback #2. If we can predict an outbreak two months before, the vaccine (that takes one month to be effective) could be used more than today.

B and E are the contenders. I would look at the key words there to determine the correct answer.
B unaffected countries often refuse<== so the fact that B presents has already happened before, so it's not something that could change the current scenario and increase the use of the vaccine.
E. Recently published research<== this is a game changer. Recently new data has been released, so the situation described by the argument is actually changed.

E is the best answer
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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mohnish104 wrote:
I don't seem to be understanding the language used in E. What I followed was that, certain climatic condition follow 'after' the outbreak. Is it before or after I am unable to follow.


Yeah, the wording is especially designed to cause confusion :-). But option E is correct.

You would generally say
storms follow humid conditions
than
humid conditions are followed by storms. Both are correct though second one is wordy.

Option E says, identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 17 Oct 2013, 01:53
Thanks Ramananda, I will keep repeating it. you are my teacher now. If I am stuck with verbal, I am gonna come to you. :-)

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 07 May 2015, 21:35
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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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 28 May 2015, 07:49
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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?

The reason why the vaccine is rarely used because
1) Expensive
2) Not effective till one month
3) Administrating after the outbreak doesn't add any value.

We need to find out a option which solves one of these problems.

A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.-> Doesn't add any value for any of the reason.

B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak -> Same issue as option A)

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 -> Doesn't add any value

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 -> Doesn't add any value

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.
-> This option gives a way to to predict that outbreak is going to occur so this option solves the problem # 3 and hence the correct answer.
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 04 May 2016, 08:27
Stem says: vaccine is not used because it is expensive and it takes a month to be effective. A farmer who wants to protect his cattle would have to use it all the time and that would cost too much. Result: they don't use it, and cattle die in outbreaks.
However the argument predicts a higher level of vaccination in the future. What would lead to this:

Assumptions:
- Vaccines would become cheaper
- Vaccines would take less than a month to be effective or perhaps would immediately effective
- Or an outbreak could become predictable, in which case farmers would only need to start vaccinating cattle a month before the outbreak, spending less money on vaccinations
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 30 May 2016, 03:01
notahug wrote:
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.


My American friend and I have been arguing for 2 days...Pls explain your answer!


We have to choose a development that has somehow changed the trend (Trend was that vaccine was not taken prior to spread of disease).

(A) This is an enticing option. We might select it thinking that vaccination would help. But again the passage does not specify whether vaccination is able to control the outbreak. Also it does not answer why suddenly this vaccine would become popular. This information is presumably known even now. Reject this option.
(B) This development occurs after outbreak. How will it encourage use of vaccine?
(C) Irrelevant.
(D) Similar to A, this situation is not new. We are searching for an option that is a recent development.
(E) This is exactly what we were looking for. This is a recent development. In case specific climatic conditions are identified, then there will be a increased likelihood of outbreak of fever. Then a pre-emptive action in the form of vaccine can be taken.

(E) is the answer.

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 06 Feb 2017, 06:20
shikha.lakhani wrote:
Please explain the reasonn for the answer choice and reason to eliminate other options


There are two reasons that the vaccine is not used:
1. Expensive
2. Not effective till one month of administering
The experts predict that in spite of the above two reasons, the vaccine would be used. Why?

The correct option should address any/both of the above two issues, i.e. it would suggest that the price would come down and/or that the vaccine can be administered at least one month before the onset of the outbreak.

Only Option E adresses one of these two issues, viz., the second issue. Hence E is the right answer.

(If you are unable to eliminate the other options using the logic described above, please write back again stating which other option do you think adresses one of the two issues.)

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 08 Feb 2017, 10:16
A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
The choice provides more information about the subject but is irrelevant in the strenghtneing or weakening
B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
The choice provides more information but does not contribute in addressing the question
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.
the answer choice is irrelevant in addresing the question
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.
does not mean that they will be using the vaccination more often in the near future.
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.
The identification of the pattern of the occurance of the outbreak is beneficial to identifieng the occurnce of the outbreak in the future and the farmers and other impacted groups can administer the vaccine on time and prevent the losses.

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 12 Jun 2017, 00:13
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.

My 2 cents.

Fever outbreaks are irregular so vaccine is not used routinely.
But, the use of vaccine will increase.

In short form,
Irregular --> little vaccine
( ) --> more vaccine.

We need to find something that fixes irregular part.
E does this.

Hence E.

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 16 Jun 2017, 14:10
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csaluja wrote:
Hi,

I was wondering why is D wrong?

The experts' predication is "that use of the vaccine will increase significantly within the next few years"

We know that the vaccine is exists, so why not administer the vaccine routinely to avoid infections? - because "it is too expensive for farmers to use routinely"

Why not just administer the vaccine once an outbreak starts? Doing so would help very little because the vaccine is not effective until a month after vaccination.

Given these reasons explaining why the vaccine is rarely used, why do experts predict that its use will increase significantly within the next few years?

Quote:
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.

This information does not help explain why the use of the vaccine might increase significantly within the next few years, so (D) can be eliminated.

I hope this helps!
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever [#permalink]

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New post 09 Jul 2017, 16:02
By process of elimination only option E remains valid.
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Re: Outbreaks of Rift Valley fever occur irregularly in East Africa, sever   [#permalink] 09 Jul 2017, 16:02

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