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# Birds and mammals can be infected with West Nile virus only through

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Senior Manager
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Birds and mammals can be infected with West Nile virus only through  [#permalink]

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26 Nov 2019, 14:42
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Difficulty:

45% (medium)

Question Stats:

65% (01:38) correct 35% (01:55) wrong based on 130 sessions

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Birds and mammals can be infected with West Nile virus only through mosquito bites. Mosquitoes, in turn, become infected with the virus when they bite certain infected birds or mammals. The virus was originally detected in northern Africa and spread to North America in the 1990s. Humans sometimes catch West Nile virus, but the virus never becomes abundant enough in human blood to infect a mosquito.

The statements above, if true, most strongly support which one of the following?

(A) West Nile virus will never be a common disease among humans.

(B) West Nile virus is most common in those parts of North America with the highest density of mosquitoes.

(C) Some people who become infected with West Nile virus never show symptoms of illness.

(D) West Nile virus infects more people in northern Africa than it does in North America.

(E) West Nile virus was not carried to North America via an infected person.
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Re: Birds and mammals can be infected with West Nile virus only through  [#permalink]

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26 Nov 2019, 21:17

(A) Correct as the threshold value will never reach.

(B) No evidence as such.

(C) Symptoms of illness is out of scope.

(D) No evidence as such.

(E) Source/carrier is not being discussed.
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Re: Birds and mammals can be infected with West Nile virus only through  [#permalink]

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27 Nov 2019, 21:48
I'd like E,

because last sentence says: but the virus never becomes abundant enough in human blood to infect a mosquito. so mosquito won't be infected from human, if the virus spread, it must be from mosquito that be infected from other source except human
what's the OE?
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Re: Birds and mammals can be infected with West Nile virus only through  [#permalink]

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28 Nov 2019, 07:47
Birds and mammals can be infected with West Nile virus only through mosquito bites. Mosquitoes, in turn, become infected with the virus when they bite certain infected birds or mammals. The virus was originally detected in northern Africa and spread to North America in the 1990s. Humans sometimes catch West Nile virus, but the virus never becomes abundant enough in human blood to infect a mosquito.

Type- inference
1. Mosquitoes, in turn, become infected with the virus when they bite certain infected birds or mammals
2. Humans sometimes catch West Nile virus, but the virus never becomes abundant enough in human blood to infect a mosquito.

(A) West Nile virus will never be a common disease among humans.- incorrect, will never is too strong, we know that humans do not transmit

(B) West Nile virus is most common in those parts of North America with the highest density of mosquitoes.- incorrect, do we know whether birds and mammals are present in that part?

(C) Some people who become infected with West Nile virus never show symptoms of illness.- incorrect, the visibility of symptoms is not discussed

(D) West Nile virus infects more people in northern Africa than it does in North America.- incorrect, we are not given any information to make a comparison

(E) West Nile virus was not carried to North America via an infected person.- Correct- on combining 1 and 2.

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Re: Birds and mammals can be infected with West Nile virus only through  [#permalink]

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30 Nov 2019, 22:31
GMAT Aspirant wrote:

(A) Correct as the threshold value will never reach.

(B) No evidence as such.

(C) Symptoms of illness is out of scope.

(D) No evidence as such.

(E) Source/carrier is not being discussed.

The threshold value is relevant for infection of other humans through humans not for humans infection.
Re: Birds and mammals can be infected with West Nile virus only through   [#permalink] 30 Nov 2019, 22:31
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