As a child, you received the OPV vaccine and its boosters. Now you are going on a mission trip to Pakistan, and the vaccine is recommended by the Centers for Disease Control and Prevention. When you go to the health office for the vaccine, they give you the IPV vaccine. When you ask why you are receiving the IPV rather than the OPV, the personnel explain that .

there is no possibility of actually developing polio from this vaccine

Explanation:

Inactivated polio vaccine (IPV) is a vaccine developed by Jonas Salk (1955), which consists of inactivated poliovirus strains of all three poliovirus types. This vaccine (IPV) is given in the form of injection. IPV is the only polio vaccine that has been administered in the USA since 2000. On the other hand, the oral polio vaccine (OPV) is an oral vaccine, which is used in other countries. OPV was developed in 1961 by Albert Sabin by attenuating live poliovirus by the passage in laboratory culture, which produces spontaneous mutations in the viral genome. Both OPV and IPV generate systemic immunity that protects from polio. OPV may be considered better than IPV, especially in regard to the ease of administration, and there is no requirements for sterile syringes.