What important scientific advance made bacteria less dangerous to humans?
There is very many possible answers to this question, but some of the answers consist of the following few; Medicine, Shots, etc.
Discuss a time that you were sick and treated for a bacterial infection. What would have happened to you if this advancement hadn't been discovered?
One time I had the flu, back then it was highly dangerous and could kill very easily. But with the help of medicine I was able to get through the sickness and be okay after.