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:
Price Elasticity
An indicator of the sensitivity of demand for a product to variations in its price.
Greeting Cards
Printed or digital cards sent to convey messages of greeting, celebration, or other sentiments on special occasions.
Price Elasticity
An indicator of the degree to which consumers' demand for a product is affected by fluctuations in its price, showing how sensitive buyers are to changes in cost.
Perfectly Elastic Demand
A market situation in which demand for a product is infinitely sensitive to changes in price.
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