Two people were exposed to pathogen P on the same day - HSC - SSCE Biology - Question 18 - 2014 - Paper 1
Question 18
Two people were exposed to pathogen P on the same day. The graph shows the blood antibody levels for that pathogen over the following 28 days for each person.
Which... show full transcript
Worked Solution & Example Answer:Two people were exposed to pathogen P on the same day - HSC - SSCE Biology - Question 18 - 2014 - Paper 1
Step 1
Person 1 had not been previously exposed to pathogen P but had a recent organ transplant.
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Answer
This option is plausible but does not explain the rapid antibody response seen in Person 1.
Step 2
Person 1 had been previously exposed to pathogen P.
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Answer
This option is supported by the graph, as Person 1 shows a high antibody level shortly after exposure.
Step 3
Person 2 had already been vaccinated against pathogen P.
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This is a possibility, but the lower antibody levels observed suggest limited pre-existing immunity.
Step 4
Person 2 had recent contact with a person infected with a similar pathogen.
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While this could contribute to some antibody response, it does not adequately explain Person 1's strong response.
