After they slowed down the process to pass on the low cost benefit of antirabies vaccination, they are now trying to sell costly inactivated polio vaccine (IPV) and slow down the introduction of low cost intradermal IPV, to benefit multinationals.
Moreover when pressure is rising to introduce low cost IPV, they are trying to chip in many needle free devices to help some other multinationals to make programme costs further high and poor countries having to pay more.
Below are some studies, just copy paste the link for more understanding,
The immunity using needle free jet devices is not optimum as is evident in the study in Cuba, the link,
But IPV given with needle and syringe is equally effective as is evident in a study in Philippines, the link,
Randomized controlled study of fractional doses of inactivated poliovirus vaccine administered intradermally with a needle in the Philippines
So, we need to explore low cost intradermal IPV with needle and syringe as a viable option, to include devices will make the programme more costly and unviable.