When bacteria survive and adapt, we say that bacteria developed antibiotic resistance. It is a natural process that sooner or later takes place, but when we use antibiotics more often, and especially when we use them in the wrong way, we make this process faster. Up to one-third to one-half of antibiotic being used by us is unnecessary or inappropriate.
The abusive use made already a lot of antibiotics ineffective against bacteria which are now resistant, and we are less effective in curing people. Some of the infections which are becoming more difficult to cure are tuberculosis, pneumonia, gonorrhea, and salmonellosis. Hospital stays extend, medical costs rise, and mortality rates spike.