What were the 4 most deadly illnesses, that killed people back in the 1800's and earlier on?

Question:

Before doctors had all the medicines we have in today's time and before we had all of this technology, what were the most deadly illnesses that killed people. I mean illnesses that can be treat today with medicine, doctors didn't have back then (like strep throat.) I am really curious in this question.

Answers:
Although malaria was the major cause of recurrent illness and was not infrequently lethal, especially among the very young, it is important to keep in mind that the principal causes of death in the region in the 1850's were a host of other infectious diseases: infant diarrhea; exanthemata in childhood, particularly scarlet fever; diphtheria; pulmonary tuberculosis; lobar pneumonia; typhoid fever; and bacillary dysentery. These nineteenth century destroyers, now well controlled in developed countries, were then a dreaded menace to every family.
Add to this the Plague and cholera.

The Spanish Flue epidemic in the early part of the last century killed many millions of people - that was a virus - nothing modern medicine could do about it if a similar one came along today.
As far as treatable illnesses, pnuemonia killed millions of people back in the days. Syphillis killed nearly as many.

The plague, tuberculosis, small pox

What were the 4 most deadly illnesses, that killed people back in the 1800's and earlier on?

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