As data privacy activists raised questions about the level of information sharing with Pfizer, Israel's health ministry released a partially redacted copy of the terms.
President Jair Bolsonaro is under growing pressure to start inoculations in Brazil, which has lost more than 200,000 to COVID-19 - the worst death toll outside the United States.
Crude inventories in the US dropped by 5.8 million barrels last week to around 484.5 million barrels, data from the American Petroleum Institute showed late on Tuesday.
He said the COVAX programme could begin vaccinating people in February, and there was an effort to speed it up so some vaccinations in poor countries could take place this month.
World Health Organization director-general Tedros Adhanom Ghebreyesus asked countries that have booked excess vaccine doses to "donate and release them to Covax immediately.
Johnson said more than 1.3 million people had been vaccinated as of Tuesday afternoon, adding that nearly 1,000 vaccination sites would be ready by the end of the week.
Worries around the new virus strain also saw investors look past an agreement over a $900 billion fiscal aid package in the United States that will be set to vote on Monday.
Announcing the agency had secured nearly two billion doses of vaccine candidates, the WHO said in a statement that this would "enable all participating economies to have access to doses in the first half of 2021, with first deliveries anticipated to begin in the first quarter of 2021."
With hospitalizations setting a record for the 19th day in a row - nearly 113,000 patients under treatment on Wednesday - health experts warn that fatalities will rise higher still in the weeks ahead, even as the vaccine campaign steadily expands.