(BEIJING) -- China's food and drug regulators on Wednesday authorized a domestic pharmaceutical firm to begin commercial production of a human bird flu vaccine, following more than two years of clinical trials. The firm, Beijing-based Sinovac Biotech Co., Ltd. will produce vaccines to defend humans against the H5N1 virus and its epidemic variety, making China the world's second country with the technology and industrial capacity to produce human bird flu vaccine. According to Yin Weidong, general manager of the firm, Sinovac has the ability to produce new vaccines even if the virus mutates in humans. China started clinical research and...