Respuesta :
Answer:
because it is till an active disease in the United states
Answer:
because it is required by federal mandates
Explanation:
Inactivated polio vaccine (IPV) is the only polio vaccine that has been given in the United States since 2000. It is given by shot in the arm or leg, depending on the person's age. Oral polio vaccine (OPV) is used in other countries. CDC recommends that children get four doses of polio vaccine
