The pressure on European assets, however, eased after a sell-off on Monday caused by shut-down of the border with France and angst over Brexit trade talks.
With European stock markets back in positive territory, sentiment improved on foreign exchange markets for Europe's top currencies.
Experts said there was no evidence that vaccines would not protect against the new virus variant, but Britain's chief scientific adviser said that in the meantime tighter restrictions on public life in Britain were likely.
Bullion had jumped more than 1pc earlier in the session, helped by reports that U.S. congressional leaders reached agreement on a $900 billion package.
South Africa said on Friday a virus strain similar to the one reported in the United Kingdom was driving a second wave in the country, prompting some countries to include South Africa in their travel bans.
The Bank of Japan ends its two-day policy meeting on Friday and is expected to leave rates steady but announce an extension of a package of steps aimed at easing corporate funding strains.
The dollar index, which measures the greenback against a basket of currencies, was last at 90.477, after sinking as low as 90.419 on Monday, a level not seen since April 2018.
Bond yields rose on Monday after an extension of trade talks between Britain and the European Union eased fears of a messy parting of ways between the two.
The pound gained after the UK and European Union agreed on Sunday to continue Brexit talks and the EU's chief negotiator said a deal was still possible.
British 10-year Gilts were up 2.5 bps at 0.20%, while Ireland -- the euro zone country most affected by Brexit -- saw its 10-year borrowing costs rise off last week's record low to -0.31%.
Euro zone bond yields resumed their downward trend, with Germany's benchmark 10-year bond yield falling to a one-month low of -0.639pc at 1238 GMT, down 4 bps on the day.
The ECB expanded its debt purchase scheme and agreed to provide banks with even more ultra-cheap liquidity as long as they keep passing the cash onto companies.
The ECB also said it is monitoring the euro's exchange rate with regard to its possible implications for the medium-term inflation outlook.