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Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier”

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Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” [#permalink]

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New post 01 Nov 2014, 11:21
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A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

54% (01:17) correct 46% (01:07) wrong based on 248 sessions

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Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” who was infected with the typhoid bacillus for a prolonged period of time. She developed neither typhoid fever nor its symptoms; however, other people could, and did, develop this disease after contact with her.

Which of the following is best supported by the statements above?

A. Typhoid fever is not always fatal.

B. Typhoid fever is equally communicable whether the person infected with the typhoid bacillus actually has the disease or not.

C. The absence of the usual symptoms of typhoid fever is not always a reliable indicator that one does not have typhoid fever.

D. Typhoid fever sometimes occurs even when the typhoid bacillus is not present.

E. The typhoid bacillus does not always cause typhoid fever.

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[Reveal] Spoiler: OA

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Re: Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” [#permalink]

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New post 02 Nov 2014, 15:45
Answer: E

Its between C and E.
C is wrong because its relating symptoms with typhoid fever. This does nothing to strengthen the claim since its talking about reliability so it may be true or false.
E is best because its relating typhoid bacillus with typhoid fever which is a closer parallel to the argument and strengthens the claim.

jgk wrote:
Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” who was infected with the typhoid bacillus for a prolonged period of time. She developed neither typhoid fever nor its symptoms; however, other people could, and did, develop this disease after contact with her.

Which of the following is best supported by the statements above?

A. Typhoid fever is not always fatal.

B. Typhoid fever is equally communicable whether the person infected with the typhoid bacillus actually has the disease or not.

C. The absence of the usual symptoms of typhoid fever is not always a reliable indicator that one does not have typhoid fever.

D. Typhoid fever sometimes occurs even when the typhoid bacillus is not present.

E. The typhoid bacillus does not always cause typhoid fever.

800 score

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Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” [#permalink]

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jgk wrote:
Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” who was infected with the typhoid bacillus for a prolonged period of time. She developed neither typhoid fever nor its symptoms; however, other people could, and did, develop this disease after contact with her.

Which of the following is best supported by the statements above?

A. Typhoid fever is not always fatal.

B. Typhoid fever is equally communicable whether the person infected with the typhoid bacillus actually has the disease or not.

C. The absence of the usual symptoms of typhoid fever is not always a reliable indicator that one does not have typhoid fever.

D. Typhoid fever sometimes occurs even when the typhoid bacillus is not present.

E. The typhoid bacillus does not always cause typhoid fever.

800 score


This is an inference question.

Option B suggest the equal probability of getting typh from those who got the bacteria and have the disease vs those who got the bacteria and dont have the disease. We can not infer this from just one instance.

Option C is a 180...Mary did not get the symptoms as well as the disease. C however talks about those who don't show the symptoms but still has the disease.

E correctly infers from the stimulus.

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Typhoid mary was a 'typhoid' carrier [#permalink]

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Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier” who was infected with the typhoid bacillus for a prolonged period of time, She developed neither the disease nor its symptoms; however, other people could, and did, develop this disease after contact with her.

Which of the following is best supported by the statements above?

A. Typhoid fever is not always fatal.

B. Typhoid fever is equally communicable whether the person infected with the typhoid bacillus actually has the disease or not.

C. The absence of the usual symptoms of typhoid fever is not always a reliable indicator that one does not have typhoid fever.

D. Typhoid fever sometimes occurs even when the typhoid bacillus is not present.

E. The typhoid bacillus does not always cause typhoid fever.

Last edited by broall on 06 Sep 2017, 04:27, edited 1 time in total.
Merged topic. Please search before posting question.

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Re: Typhoid mary was a 'typhoid' carrier [#permalink]

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New post 05 Sep 2017, 11:15
C seems more appropriate.

Could you give a detailed explanation as to why E is right?

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Re: Typhoid mary was a 'typhoid' carrier [#permalink]

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New post 05 Sep 2017, 12:06
The question looks incomplete as there is nothing mentioned in the statement that matches the OA.

Please give detailed explanation.

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Re: Typhoid mary was a 'typhoid' carrier [#permalink]

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Sushmitha123 wrote:
C seems more appropriate.

Could you give a detailed explanation as to why E is right?


The stimulus mentioned that - she was infected with the typhoid bacillus, but she developed neither the disease nor its symptoms.
So, we can infer that the presence of typhoid bacillus do not always develop the disease or its symptoms. But, we can't infer that - the presence of the symptoms is the surest indicator of the disease, or vice versa.
So, we can see that C links fever and symptoms.. So eliminate C

puneetj88 wrote:
The question looks incomplete as there is nothing mentioned in the statement that matches the OA.

Please give detailed explanation.


The OA is correct and very well matches with the stated fact : she was infected with the typhoid bacillus, but she developed neither the disease nor its symptoms.
That means that there can be or can't be a causal connection, just that we are not sure of it. So, "does not always" in E is perfect.

I highly doubt that this is a sub 700 level problem...

Cheers !!
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Re: Typhoid mary was a 'typhoid' carrier [#permalink]

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New post 06 Sep 2017, 01:34
I agree with godot53. The statement doesn't establish a casual relationship

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Re: Typhoid mary was a 'typhoid' carrier   [#permalink] 06 Sep 2017, 01:34
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Mary Mallon, known as “Typhoid Mary,” was a typhoid “carrier”

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