Considering China's recent history of selling the organs of prisoners, and God knows what else, I have little doubt that they have, and continue to experiment on prisoners with live virus to determine sufficient antibody levels, how long immunity lasts, etc.
Dr. John Dye, chief of viral immunology at the USAMRIID lab at Fort Detrick, confirmed to Just the News that his team began testing the extract known as oleandrin a few years ago and found it was effective in fighting the Ebola and Marburg viruses. The Army lab is now ramping up a rapid plan to test oleandrin against COVID-19.