Nutrition, Hygiene, Refrigeration, Food Safety, Proper Disposal of Sewage also changed in the same time frame. Look at your graph! Death by measles and whooping cough declined before introduction of the vaccines. You won't get scarlet fever if you have enough vitamin A, same with birth defects caused by measles. Nutrition and Hygiene are the reason why we're healthier Period
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I totally agree my goodness we don't live in the dark ages anymore. I think being smart is better than injecting crap into our systems. Thanks for reading my post.