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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 

3 ) 

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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