evidence: As part of the Endgame strategy for polio eradication, the inactivated polio vaccine (IPV) is being introduced into the routine immunization systems of every country that currently uses the oral polio vaccine (OPV). Half way into 2015, exciting progress is being made towards this goal, which will help to boost immunity against all types of poliovirus, giving children higher protection against paralytic polio. [...] The introduction of IPV has already made great strides, with 20 countries adding the vaccine to their immunization schedules between January and July this year alone, bringing the number of countries using the vaccine to 97. This means that 51% of the global birth cohort is now receiving at least one-dose of IPV. A surge of introductions in the coming months will lead to over 75% of countries having at least one dose of IPV in their routine immunization systems by the end of October. By the end of the year, all countries with the highest risk of wild poliovirus or the emergence of vaccine-derived polioviruses- the highest priority categories for IPV introduction- will have completed the introduction. This will ensure that the most vulnerable children are given the best possible protection against polio. [...] Read more about the global introduction of inactivated polio vaccine and the switch here or see find more information on the WHO website.