European leaders are reinstating coronavirus restrictions as the new Omicron variant continues to spread across the continent.
Germany and Portugal are among nations announcing post-Christmas curbs and greater social distancing measures.
Omicron is already the dominant strain in many European countries.
Spain has reported its highest number of daily cases since the start of the pandemic and France has warned daily cases there could soon pass 100,000.
French Health Minister Olivier Véran said the increase in daily infections in the country, currently at about 70,000, would be driven by the Omicron variant, which he said was likely to become the dominant variant by early January.
The surge in cases across Europe will push health systems towards the brink of collapse, the World Health Organization's top official in the continent has warned.
Hans Kluge said "another storm" was coming and governments should brace for significant increases in cases.
France began vaccinating children between the ages of five and 11 on Wednesday, but said that boosters were not currently being offered to 12 to 15-year-olds.
Germany announced that from 28 December limits would return that restrict private gatherings to 10 people and nightclubs would close. Football matches from that date will also be played behind closed doors.
"Coronavirus doesn't take a Christmas break," Germany's Chancellor Olaf Scholz said on Tuesday.
"We cannot - and must not - close our eyes to this next wave, which is beginning to loom over us," he added.
Meanwhile, Portugal ordered bars and nightclubs to shut from 26 December, and made working from home obligatory from that date until 9 January. Outdoor gatherings will be limited to 10 people.
Bars and restaurants in Finland will have to close at 22:00 on 24 December, as the Nordic nation sees infections at a record level. For three weeks from 28 December, restaurants will have to close at 18:00 with limited seating. Travellers coming from the EU's border-free Schengen zone will have to show a negative Covid test.