More than half of Europe’s population may be infected with omicron within weeks at current transmission rates, a World Health Organization official said.

The fast-spreading variant represents a "west-to-east tidal wave sweeping across the region,” said Hans Kluge, the regional director of the WHO for Europe at a briefing Tuesday. He cited forecasts by the Institute for Health Metrics and Evaluation that the majority of Europeans could catch it in the next six to eight weeks.

The latest COVID-19 surge has so far resulted in fewer symptomatic cases and lower death rates than in previous waves, fueling optimism the pandemic may be easing. However, the WHO has repeatedly warned against underestimating the omicron strain as mild. Kluge said hospitalization rates are increasing in Europe, which is putting pressure on health systems.