Curious about COVID-19 clinical trials? NIH has launched a series of clinical trials to evaluate the safety and effectiveness of different blood thinners in treating adults with COVID-19, particularly those experiencing life-threatening blood clotting. The trials, known as ACTIV-4, are part of NIH’s Accelerating COVID-19 Therapeutic Interventions and Vaccines initiative & funded by Operation Warp Speed. They will include three categories of patients and take place at more than 100 sites around the world. For more information about NIH COVID-19 efforts, visit: https://covid19.nih.gov/ or follow @nihgov on Instagram. (Originally posted on Facebook on September 10, 2020)