Suppose that the figure below shows the concentration of antibodies for an antigen produced by Clostridium tetani,a bacterium that causes tetanus.What could trigger the increase in antibody production marked by the arrow? 
Definitions:
Supply Curve
a graphical representation showing how the quantity supplied of a good or service varies with its price.
Marginal Cost
The expense incurred by producing one additional unit of a product.
Average Variable Cost
The total variable cost of production divided by the quantity of output produced, reflecting the average cost of each unit of output on variable factors.
Exclusive Right
A legal entitlement granting someone the sole authority to engage in a certain activity or use a specific property.
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