Amitabh Bachchan, one of India’s best-known movie stars, has tested positive for COVID-19 together with his actor son, Abhishek Bachchan, they said late on Saturday. Both were admitted to the same private hospital. “I have tested COVID-19 positive … shifted to the hospital … hospital informing authorities … family and staff undergone tests, results awaited,’’ Amitabh Bachchan, 77, said in a tweet. Minutes later, his 44-year-old son, Abhishek also tweeted he had been infected. “Both...