May 6 (Reuters) - Canada’s main stock index fell on Thursday, weighed down by energy stocks tracking lower oil prices as a renewed surge in coronavirus infections in some Asian countries raised concerns about demand. * At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 5.49 points, or 0.03%, at 19,305.25. Reporting by Shivani Kumaresan in Bengaluru; Editing by Maju Samuel Our Standards: The Thomson Reuters Trust Principles.