Medicine 4: Huge *progress* was made in medicine in the *19th century*, but which area had *not* improved by *1900*?

Question

Huge *progress* was made in medicine in the *19th century*, but which area had *not* improved by *1900*?

Happy Bat · Accepted Answer

Although doctors understood the *cause* of illnesses much better by *1900*, they had not been able to develop any new *treatments*

Huge progress was made in medicine in the 19th century, but which area had not improved by 1900?