Dec 11 (Reuters) - Wall Street’s main indexes opened lower on Friday as delays over a new fiscal stimulus package and surging coronavirus infections dented sentiment even as regulators moved toward emergency use authorization of a COVID-19 vaccine. The Dow Jones Industrial Average fell 64.77 points, or 0.22%, at 29,934.49 after the market opened. The S&P 500 dropped 16 points, or 0.44%, to 3,652.10, while the Nasdaq Composite dropped 65.45 points, or 0.53%, to 12.340.35. (Reporting by Shriya Ramakrishnan in Bengaluru; Editing by Shounak Dasgupta)