Megastar Amitabh Bachchan on Thursday said he has tested negative for COVID-19 and has returned to work. The 79-year-old actor, who had tested positive on August 24, shared the news in a post on his official blog. "Back at work...your prayers, gratitude... negative last night .. and 9 days isolation over... mandatory is 7 days," Bachchan wrote. The veteran star also thanked his fans, whom he addresses as extended family, for their well wishes.