Oil prices rose on Monday after a weak start, adding to the gains of the last three months, although patchy coronavirus vaccine rollouts, new infections and the discovery of new variants are casting a shadow over the outlook for demand.

Brent crude futures were up 36 cents, or 0.7%, at $55.40 a barrel by 0612 GMT, while U.S. West Texas Intermediate (WTI) gained 24 cents, or 0.5%, to $52.44. Both benchmarks gained nearly 8% in January, as reported by Reuters.

Read alsoUkraine not to buy gas directly from Russia – PM ShmyhalOil prices have been boosted by vaccination programmes getting underway in hard-hit countries and output cuts by major producers like Saudi Arabia. But euphoria over a possible end to the pandemic has been undermined by the slow pace of vaccinations and the rise of new variants of the coronavirus.

Still, with more vaccines proving successful in trials and infections falling in some areas, demand for oil and fuel is likely to pick up as more of the world's population gets inoculated against COVID-19.

Oil prices are expected to remain around current levels for most of this year before a recovery gains ground towards the end of 2021, a Reuters poll showed late on Friday.

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