The sad thing is, that we could be a lot further in eradication of many diseases. We are on a good way with polio and measles, but the uneducated and plain stupid people that refuse to vaccinate are a grave danger to that endeavour. 
Also, the shortsightet and ideologic agenda of many &quot;ecological&quot; organizations for banning DDT was a huge setback in the fight for the eradication of malaria, as is now the zealotry against genetic therapy and stem cell research.