By Nupur AnandMUMBAI (Reuters) - India's most famous film star Amitabh Bachchan, and his son Abhishek, are in stable condition after testing positive for the coronavirus, a hospital official and government health authorities said on Sunday. The 77-year-old legendary actor said in a tweet on Saturday night that he had tested positive for the highly infectious virus.Within minutes, his actor son Abhishek Bachchan, 44, tweeted that he had also tested positive.