3 ms·Increasing wealth and overall hygiene. 99% polio cases are nowadays in developing countries.by t0bia_s 2y agoIncreasing wealth and overall hygiene. 99% polio cases are nowadays in developing countries.exe34 2y agoWhat mechanism would you suggest connects wealth with polio?t0bia_s 2y agoI'm not sure if I understand a question. You mean how could wealth help with disapearing of polio?