Dr. Wenliang’s message went viral, becoming the earliest warning of what we now know today as Covid-19. He returned to work, but contracted Covid from a patient, and died on February 7, 2020.

Four years later, investigations about the virus’s origins aren’t going forward, largely due to China’s reluctance to facilitate a comprehensive investigation by the WHO, the World Health Organization. Beijing hesitates to provide access to critical raw data which would not only help to identify the exact cause of the virus but would also facilitate the preparation for future pandemics.