antigen test

The **antigen test** is a medical diagnostic tool used to quickly detect the presence of specific proteins from a virus, such as SARS-CoV-2, the virus responsible for COVID-19. Unlike PCR tests that identify viral genetic material, antigen tests target viral surface proteins, allowing for faster results, often within minutes. These tests are commonly used for rapid screening in clinical settings, at-home testing, and mass testing efforts to help identify and isolate infectious individuals promptly. Antigen tests are valued for their speed and convenience, although they may be less sensitive than molecular tests, especially in cases with low viral load.