Why did polio become lethal since the 1880s? – Part 2
4. But the medical profession is in two minds The 8th edition (2024) of the book, “Plotkin’s Vaccines”, seems to promote an entirely different theory – that it is poor sanitation which leads to polio: “Lower socioeconomic status is a risk for paralytic poliomyelitis in developing countries, probably because children belonging to the lower socioeconomic…