Water treatment and sanitation dates back to the 1800's.
So why are kids still dying today of vaccine preventable disease?
https://archive.epa.gov/water/archive/web/pdf/2001_11_15_consumer_hist.pdf
So why are kids still dying today of vaccine preventable disease?
https://archive.epa.gov/water/archive/web/pdf/2001_11_15_consumer_hist.pdf
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My point is that sanitation was managed quite well. It wasn't until vaccines, that infant mortality rates really came down.