That's not really what he's saying. Here's an article that better explains his position: https://www.imperial.ac.uk/news/187932/polio-going-away-without-fight-v

That's not really what he's saying. Here's an article that better explains his position: https://www.imperial.ac.uk/news/187932/polio-going-away-without-fight-vital/ https://www.imperial.ac.uk/news/187932/polio-going-away-with... > The oral polio vaccine contained three types, or strains, of the virus (types one, two and three). The vaccine, given to young children, is dropped onto the tongue, where it then travels through the stomach and digestive system. The live viruses in the vaccine have been weakened, so that it can’t cause disease. However, in very rare cases, and only in populations where immunisation rates are low, the vaccine virus can mutate in the intestines and regain the ability to cause paralysis, resulting in VDPV. The most common of the three vaccine strains causing VDPV has been the type 2 strain. > Although the person who received the vaccine does not develop polio, the reactivated polio vaccine leaves their body in faeces and can potentially infect others. > This is not a risk with the injectable polio vaccine, such as the one given in the UK, as the virus has been inactivated and doesn’t enter the gut. However, this vaccine cannot be used alone in places at risk of polio and where immunity is low. Although it protects an individual from paralysis, it does not prevent the virus being transferred from person to person – an important benefit of the oral vaccine