Wu Yiling is one of China’s highest ranked scientists. With a fortune that neared $US6 billion ($8.3 billion), he was also part of the world’s 500 richest people. That was until this month, when the son of another Chinese billionaire sparked debate online with a post doubting the efficacy of Mr Wu’s drug used to treat COVID-19. The herbal remedy, Lianhua Qingwen, is one of three traditional treatments the central government has recommended and was sent to households in Shanghai and Hong Kong during the latest omicron wave. After a meteoric rise in Mr Wu’s Shijiazhuang Yiling Pharmaceutical Co, the...