Omicron cast gloom over Christmas celebrations across Europe for the second year running -- and it looks set to do the same for New Year celebrations too.
Several countries are considering more restrictions to add to the patchwork of lockdowns and other measures already in place around Europe.
And the top US infectious disease expert, Dr Anthony Fauci, warned on Monday that with the rise of the highly contagious coronavirus Omicron variant, "it’s going to get worse before it gets better”.
“We don’t expect things are going to turn around in a few days to a week. It likely will take much longer than that, but that’s unpredictable," he said on ABC.
It is the unpredictability that is keeping governments second-guessing and picking widely varying strategies to beat back the pandemic.
Governments monitoring the data as new year approaches
The French government and British prime minister Boris Johnson were assessing the latest data and the need to counter the record numbers of COVID-19 infections with more measures to keep people apart at a time when they want to be together.
But with indications that Omicron might be a milder variant despite its extraordinary ability to infect people, politicians were caught in a bind over whether to spoil yet another party or play it safe to make sure health care systems don't collapse.
Further complicating matters was the lack of full data over the Christmas weekend, which made it more difficult to chart Omicron's course.
In Belgium, people faced their first real test with several new measures on Monday.
Shopping in large groups was banned, and movie theatres and concert halls closed at a time when countless families are on vacation together.
The calls to close theatres and arts centres came in for especially heavy criticism.
"We need it also for our mental health. It is the only way for people to live experiences, to tell stories. It is of paramount importance for us to be open in these complicated and complex times,” said Michael De Kok, artistic director of the Flemish Royal Theatre.
Some movie theatres stayed open in an act of civil disobedience, and police, already stretched over the holidays, said they would not be able to enforce all closings.
Communal celebrations like New Year's fireworks, which usually draw crowds of thousands in Brussels, are off. Nightclubs are already closed, and restaurants and bars must shut their doors at 11 pm.
In Britain, there are similar moves. Scotland planned to close its nightclubs on Monday. Northern Ireland and Wales did so on Sunday, though they remain open in England.
Johnson, who has resisted ordering new restrictions but hasn’t ruled them out, was expected to be briefed Monday on the latest data on the spread of Omicron.
For football fans, even the English Premier League is under threat. The league has now called off 15 matches over the past two and a half weeks, and more could follow.
Britain's daily infection numbers reached a new high of 122,186 on Friday, but there were no figures over the long Christmas weekend.
France has recorded more than 100,000 infections in a single day for the first time in the pandemic, and COVID-19 hospitalisations have doubled over the past month.
President Emmanuel Macron’s government also scheduled emergency meetings Monday to discuss its next steps.
It is hoped that stepped-up vaccinations will be enough.
The government is pushing a draft law that would require people to be vaccinated to enter all restaurants and many public venues, instead of the current health pass system that allows individuals to produce a negative test or proof of recovery if they are not vaccinated.
This piecemeal, often hesitant approach is visible through much of Europe.
In Poland, a nation of 38 million where the daily death toll now often tops 500, nightclubs will be allowed to reopen on New Year's Eve, with the government unwilling to go against the many voters opposed to restrictions and mandatory vaccinations.
In Italy, the government has not mandated any rules for private gatherings but has banned outdoor events on New Year’s Eve and closed nightclubs until the end of January.
The Netherlands has gone further than most other European countries, shutting down all non-essential stores, restaurants, and bars, and extending the school holidays in a partial new lockdown.