The World Health Organisation's Europe office says projections show its 53-country region could face another 700,000 deaths in the coronavirus pandemic by next spring, topping 2 million in total.
WHO Europe, which is based in Copenhagen, Denmark, also cited growing evidence of a decline in protection against infection and mild disease through vaccines, and said a "booster dose" should be given as a priority to the most vulnerable populations — including people with weakened immune systems — as well as people over age 60 and health care workers.
The UN health agency's international headquarters in Geneva, however, has repeatedly called for a moratorium on the use of boosters through year-end so that doses can be made available for many developing countries that have faced a severe lack of the Covid-19 vaccines compared to the rich world.
WHO Europe called on people to get vaccinated and respect proper hygiene and practise social distancing to help stop the spread of the virus.