https://phys.org/news/2018-07-bacteria-lungs-easier-antibiotics.html

Antibiotic medications are used to kill bacteria, which can cause illness and disease. They have made a major contribution to human health. Many diseases that once killed people can now be treated effectively with antibiotics. However, some bacteria have become resistant to commonly used antibiotics.

Antibiotic resistant bacteria are bacteria that are not controlled or killed by antibiotics. They are able to survive and even multiply in the presence of an antibiotic. Most infection-causing bacteria can become resistant to at least some antibiotics. Bacteria are increasingly becoming antibiotic-resistant, making infections such as pneumonia, tuberculosis harder to treat, leading to increased medical costs, prolonged hospital stays and higher mortality.