April 22 (Reuters) - Canada’s main stock index fell on Thursday, weighed by lower oil prices as a renewed surge in coronavirus infections in some Asian countries raised concerns about demand. * At 14:30 a.m. ET (13:30 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 17.84 points, or 0.1%, at 19,125.41. (Reporting by Shashank Nayar in Bengaluru; Editing by Amy Caren Daniel)