Clean drinking water, washing of hands, and general hygiene.
Now diarrhoea still kills lots of people globally in the developing world. Many charities spend lots of time, effort, resources and money, spreading information, teaching, and giving supplies like soap for masses of people. **This is still a massive global problem!**
It is only in the mid-1800s thanks to Pasteur and Semmelweis we learned about germs and importance of hygiene.
Edit: and just to add it isn’t like we are that good with this stuff in the developed world either. Whenever there are noro-virus outbreaks, it is because of fecal-oral transmission. To put it simple, people don’t wash their hands after going to the toilet!
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