The bacterium that causes the disease tetanus produces a toxin that acts as an antigen.
The graph shows the concentration of an antibody in the blood of two people, G and H.
On day 0, G was injected with antibodies to the tetanus toxin and H was injected with the vaccine for tetanus.
What would be the result after G and H were infected with the tetanus bacteria on day 20?
1 )
concentration of antibodies in H would remain constant
2 )
G would fail to produce tetanus antibodies
G would peak in antibody production 12 days after infection
4 )
H would produce a new antibody peak 12 days after infection
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