<p>Antibiotics are often prescribed for upper respiratory infections (URIs) in the United States, despite the fact that most URIs are caused by viruses and do not require antibiotics. This inappropriate prescribing contributes to the development of antibiotic-resistant bacteria, which can lead to more serious infections and even death. Antibiotics can also cause side effects, such as nausea, diarrhea, and rash. The unnecessary use of antibiotics also increases healthcare costs.</p>