Four groups of people (A, B, C and D) were exposed to infection by a pathogenic virus. Researchers measured the level of antibodies in their blood before and after they were infected. The results are summarised in the graphs. PAL is the Protective Antibody Level – the level required to give protection from the virus.
Which group of people would have suffered the effects of the viral infection?
1 )
3 )
4 )
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