A vaccine is available against most common strains of the influenza virus.
The virus that causes influenza often undergoes mutation in the gene coding for its antigenic protein.
Which statements explain why vaccinated people are not immune to a mutated influenza virus?
1 They will not have primary immune response to the mutated antigen.
2 They will not have a secondary immune response to the mutated antigen.
3 Their memory cells do not recognise the mutated antigen.
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 and 3 only
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