This vaccine also contains all 3 types of polio virus which are inactivated by formalin. It needs to be injected and works by producing protective antibodies in the blood – thus preventing the spread of poliovirus to the central nervous system. However, it induces very low levels of local immunity to poliovirus, inside the gut. As a result, it provides individual protection against polio paralysis but, unlike OPV, cannot prevent the spread of wild poliovirus.

In other words, IPV renders protection to only the recipient.