First of all "Right On!" 👍
I've been researching Diphtheria mortality in the US around the year 1900 for a book project. Not much data from the US but the UK data are there for death before age 5, all causes. I could find nothing more specific.
My medical family started with Dr. Willam A. Rohlf who graduated in 1891 from the original med school in Iowa City. He wrote a book late in life about his experiences. I put it up on the web in the 1990s.
He goes into much detail about diphtheria, the (then) new antitoxin, and treating the disease with it.
FYI to all who might be interested...
https://gmd.rathe.org/chapt10.html
https://gmd.rathe.org/chapt14.html
https://gmd.rathe.org/chapt15.html
It is a TERRIBLE disease!! And it is still out there in the world...
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