Antibiotics are drugs that treat bacterial infections. They are often used to treat strep throat, UTIs, and other infections. Though many people think they help with colds, the flu, and sore throat caused by viruses, they do not treat these illnesses. Antibiotic resistance occurs when the bacteria have adapted to certain antibiotics, making the drugs less effective. Follow the links below to find WebMD's comprehensive coverage about how antibiotic resistance is caused, how to treat it, and much more.