* The European Union will buy an extra 100 million doses of Pfizer and BioNTech's vaccine, European Commission President Ursula von der Leyen said.
* Switzerland has documented five cases of a coronavirus variant from Britain and two cases of a South African variant.
* Britain's government needs to bring in tighter lockdown rules to avert a fresh wave of deaths from a new variant of the disease, a leading epidemiologist warned.
* Ireland began its vaccination campaign by inoculating 79-year-old Annie Lynch at a hospital in Dublin, the health service said.
* President Klaus Iohannis said Romania would donate 200,000 doses of the Pfizer-BioNTech vaccine to Moldova.
* US Vice President-elect Kamala Harris has received a vaccination live on television, as the incoming Biden administration seeks to boost confidence in the inoculation.
* The US Senate will grapple on Tuesday with whether to increase payments to Americans reeling from the pandemic and override President Donald Trump's veto of a $US740 billion ($A974 billion) defence bill.
* Argentina began to inoculate its citizens, using 300,000 doses of the Russian Sputnik V vaccine.
* Mexico expects delivery of Pfizer's vaccine to increase to more than 1.4 million doses by the end of next month.
* India has found six cases of a more infectious strain of the virus in people arriving from Britain and is likely to extend a flight ban to guard against it, officials said.
* Beijing sealed off 10 areas of its northeastern Shunyi district, the first lockdown in the Chinese capital since the last outbreak in June and July.
* Indonesia is poised to secure vaccines from Pfizer and AstraZeneca, as it awaits authorisation to begin its inoculation program with a third drug, by China's Sinovac.
* Thailand warned that more intensive measures might be necessary to halt its worst outbreak yet.
MIDDLE EAST AND AFRICA
* Turkey aims to produce Russia's Sputnik V vaccine domestically but has asked for more information before inoculating its citizens.
* Dubai is planning to inoculate 70 per cent of its population with the vaccine produced by Pfizer and BioNTech by the end of 2021, a health official said.
* The European Medicines Authority (EMA) is unlikely to be able to approve the vaccine developed by drug maker AstraZeneca and the University of Oxford in January, the watchdog's Deputy Executive Director Noel Wathion said.
* Iran launched human trials of its first domestic COVID-19 vaccine candidate.
* Global shares rose for a fourth straight day on Tuesday and oil followed suit as hopes of fresh US stimulus teed up a strong end to the year for riskier assets and had the dollar eyeing two-and-a-half-year lows.