1. A crucial component of COVID-19 prevention is rapid antigen testing to detect the SARS-CoV-2 virus by identifying viral proteins. In contrast to antibody tests, antigen tests directly detect the presence of the virus. 2. The CDC recommends a second COVID booster dose for those over 50 and other at-risk groups to maintain immunity levels as vaccine protection declines after 4 months. Additional boosters reduce symptoms and spread to vulnerable groups. 3. Older adults and immunocompromised individuals are most at risk for COVID complications, so a second booster provides better protection for these groups based on evidence that immunity wanes over time.