Second dose when they are 4 months old. Third dose when they are 6 to 18 months old. Last dose when they are 4 to 6 years old. If both vaccines are used, the shots are given first. Your child shouldn't get the OPV drops if you, your child or anyone who takes care of your child can't fight infections, is taking long-term steroid medicines, has cancer or AIDS or HIV infection.
Vaccines carry a small risk of serious harm, such as a severe allergic reaction.
On very rare occasions, OPV can cause polio because it contains live, but weakened, poliovirus. IPV can't cause polio because it does not contain live poliovirus. Gut protection means that the vaccinated person is protected from carrying the virus in his or her intestines. Although having the intestinal virus wouldn' t make your child sick, it might mean that he or she could pass the virus to others. If your child has any reaction after getting the polio vaccine, call your doctor as soon as possible.