Brent crude rose 64 cents, or 1.5%, to $44.39 a barrel by 1444 GMT, while U.S. West Texas Intermediate crude gained 43 cents, or 1%, to $41.86.
Both contracts jumped by about $1 after Pfizer Inc said that final results from late-stage trial of its vaccine showed it was 95% effective. Last week it had put the efficacy at more than 90%.
Moderna Inc on Monday said that preliminary data for its vaccine also showed it was almost 95% effective.
“Oil prices today are modestly rising on hopes that OPEC+ will decide to postpone its planned production increase in January and on the latest vaccine euphoria,” said Rystad Energy’s head of oil markets, Bjornar Tonhaugen.
To tackle weaker energy demand amid a second wave of the pandemic, Saudi Arabia called on fellow members of the OPEC+ group to be flexible to meet market needs and to be ready to adjust their agreement on output cuts.
OPEC+, comprising the Organization of the Petroleum Exporting Countries (OPEC), Russia and other producers, met on Tuesday but made no formal recommendation. The group is due to discuss policy at a full ministerial meeting to be held on Nov. 30 and Dec. 1.
Members of OPEC+ are leaning towards delaying the current plan to boost output in January by 2 million barrels per day (bpd), sources have said. They are considering a possible delay of three or six months.
Crude prices recovered from an earlier slide after the American Petroleum Institute (API) said on Tuesday U.S. crude stockpiles rose by 4.2 million barrels last week.
Official data from the Energy Information Administration data is due to be released later on Wednesday.
(Additional reporting by Yuka Obayashi in Tokyo; Editing by David Goodman)
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