BENGALURU, Dec 24 (Reuters) - Indian shares traded in a narrow range on Friday after rising for three straight sessions amid a continued global surge in the Omicron coronavirus variant expected to be less severe than the Delta variant. The NSE Nifty 50 index (.NSEI) was up 0.1% at 17,087 by 0359 GMT and the benchmark S&P BSE Sensex (.BSESN) rose 0.14% to 57,395.12. Omicron advanced across the world on Thursday, with health experts warning the battle against the COVID-19 variant was far from over despite two drugmakers saying their vaccines protected against it and two studies showing it carries a lower risk of hospitalisation. read more The information technology index (.NIFTYIT) was the lone sectoral gainer, rising 1.1%