PS: sorry my English is not good. Anyway: >Smallpox was already disappearing when they introduced the vaccine. >They only show you the graph of the "after the vaccine was introduced", >but they don't show you that the trend was already (and even more >sharply so!) falling before they introduced that vaccine. oh, and the reason why this happened is because the sanitation improved a lot in the last century. Look at this, so much for smallpox vaccine wonders: http://www.whale.to/v/obosawin1_files/table8.gif And we're talking about one of the most effective vaccines!! Things are much worse for others, as I said. But if this is the premise, I think it's enough. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .