Japanese health authorities have found it difficult to reach a conclusion on the effectiveness of anti-viral drug Avigan in treating COVID-19 patients based on the results of clinical testing by its developer, government sources said Wednesday.The latest assessment by the Pharmaceuticals and Medical Devices Agency will serve as key material for a health ministry review panel that will likely decide on Monday whether to approve the use of Avigan to treat COVID-19 in Japan.Drugmaker Fujifilm Toyama Chemical Co., a unit of Fujifilm Holdings Corp., filed for COVID-19 approval in October. Avigan…READ FULL ARTICLE