The lack of new antibiotics and the rise in drug resistance have rendered some serious and life-threatening infections untreatable, and the health care community is searching for ways to bring innovative new drugs to patients whose treatment options are limited or nonexistent.

Antibiotics save untold numbers of human lives every day. Modern medicine depends on their ability to treat and prevent infections such as pneumonia and staph. Yet drug-resistant bacteria are spreading and too often antibiotics are taken for granted. Test your knowledge.