JACKSONVILLE, Fla. – Now that two vaccines have been approved and are already being distributed, how did Jacksonville turn out in clinical trials to contribute? Hundreds of clinical trials were done in the Jacksonville area, helping approve vaccines for COVID-19. The Jacksonville Center for Clinical Research had over 700 patients for both vaccines. After months of research and clinical trials, News4Jax is told Jacksonville patients responded well. While the Moderna vaccine has only done clinical trials for ages 18 and up, Koren said more studies should be conducted.