Final answer:
The IPV or smallpox vaccine should not be given to individuals with a history of anaphylaxis to gelatin.
Step-by-step explanation:
The smallpox vaccine, also known as the IPV, should not be given to individuals with a history of anaphylaxis to gelatin. Anaphylaxis is a severe allergic reaction that can occur immediately after exposure to an allergen, and gelatin is one of the components of the vaccine. People with a history of anaphylaxis to gelatin may have an increased risk of an allergic reaction to the vaccine.