Just take a look at some of the greatest medical discoveries in history and how they still benefit us today: vaccination. Antibiotics revolutionized modern medicine, as they allowed the treatment and recovery of diseases that used to be fatal. Along with vaccination, antibiotics have facilitated the near eradication of epidemic diseases such as tuberculosis. It's hard to imagine our world without antibiotics.
Today, the medical community is studying resistant bacteria that have evolved due to the overuse of antibiotics.