3.1 Data interpretation
You can now make an estimate of the prevalence of N-antibodies in the population, and by inference the number of people who have been infected with the virus. Take a titre of >4 as being a positive result.
At this time, about 10% of the UK population had been infected with SARS-CoV2. Because your sample is relatively small, it may not accurately reflect the whole population, but you should have found at least one individual with N-antibodies.
ITQ _unit6.4.1
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When you are ready check your results. Do your results correspond? What percentage of the sample had N-antibodies?
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Of the 60 samples available, the following seven samples have IgG antibodies against nucleocapsid:
C3111, C5930, F7812, H1151, H4439, M6723, N9921
From these figures we could estimate:
Prevalence = 7/60 x100 ≈ 12%.
ITQ _unit6.4.2
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If a person is seropositive for S-antibodies, but negative for N-antibodies, what can you infer?
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They have been vaccinated with SARS-CoV2 spike protein.