Picture this: You get a urinary tract infection (ugh, we know), head to the doctor and receive a prescription for an antibiotic. This Cillin/Mycin/whatever has worked in the past, but this time your symptoms don’t go away. They get worse. Even after another round of antibiotics, you end up in the hospital—with a kidney infection. A possible reason your illness spiraled out of control? Antibiotic resistance, a health threat that affects at least 2 million people a year in the U.S. and leads to about 23,000 deaths due to now-hard-to-treat infections like UTIs and pneumonia.