Jan 4 (Reuters) - Canada's main stock index opened higher on Tuesday, starting the year on a strong footing aided by gains in energy and healthcare shares, while easing worries around the Omicron coronavirus variant further lifted sentiment.

At 9:31 a.m. ET (14:31 GMT), the Toronto Stock Exchange's S&P/TSX composite index was up 232.55 points, or 1.1%, at 21,455.39.

(Reporting by Amal S in Bengaluru; Editing by Ramakrishnan M.)